Improve MR reloading

## Theory

Every time you pushed to master it updates merge requests that has master
as target branch. So if you have 50 open merge requests point to master
it will reload all of them every time you push a single commit to
master. The funny thing is that after reloading diff of most merge
requests looks the same.

After this patch we update diff only if we push commit to master that
includes in MR commits list.

For example we have next repository:

    feature: A - B - C
    master: A

We create merge request with code from feature to master.

    MR: B - C

If we push to master commit D - MR will not be reloaded. So picture will
look next:

    feature: A - B - C
    master: A - D
    MR: B - C

And if we push to master commit B - MR will be reloaded. So picture will
look next:

    feature: A - B - C
    master: A - B
    MR: C

## Benchmark

For project with 45 open merge requests to master

Before

```
Benchmark post-receive | Cache and size:   0.060000   0.040000   0.100000 (  0.379720)
Benchmark post-receive | Push commits selection:   0.130000   0.020000   0.150000 (  0.149299)
Benchmark post-receive | Update merge requests:   9.180000   2.030000  11.210000 ( 11.971747)
Benchmark post-receive | Process commit messages:   0.140000   0.010000   0.150000 (  0.168810)
Benchmark post-receive | Push data:   0.020000   0.000000   0.020000 (  0.016363)
Benchmark post-receive | Push event and services:   0.030000   0.000000   0.030000 (  0.088062)
```

After

```
Benchmark post-receive | Cache and size:   0.070000   0.030000   0.100000 (  0.106676)
Benchmark post-receive | Push commits selection:   0.130000   0.020000   0.150000 (  0.143081)
Benchmark post-receive | Update merge requests:   0.660000   0.210000   0.870000 (  0.892663)
Benchmark post-receive | Process commit messages:   0.030000   0.000000   0.030000 (  0.029263)
Benchmark post-receive | Push data:   0.020000   0.000000   0.020000 (  0.018479)
Benchmark post-receive | Push event and services:   0.030000   0.000000   0.030000 (  0.038230)
```
- - -

## References

Discussion in gitlab/gitlabhq#1796

See merge request !1288

Update libv8

For some reason I could no longer install the previous version of libv8 on my development machine; this version bump fixes that.

I do not know if/how this change affects production environments.

See merge request !1287

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Every time you pushed to master it updates merge requests that has master
as target branch. So if you have 50 open merge requests point to master
it will reload all of them every time you push a single commit to
master. The funny thing is that after reloading diff of most merge
requests looks the same.

After this patch we update diff only if we push commit to master that
includes in MR commits list.

For example we have next repository:

feature: A - B - C
master: A

We create merge requests #1 with code from feature to master.

MR #1: B - C

If we push to master commit D - MR will not be reloaded. So picture will
look next:

feature: A - B - C
master: A - D
MR #1: B - C

And if we push to master commit B - MR will be reloaded. So picture will
look next:

feature: A - B - C
master: A - B
MR #1: C
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

This selfish change fixes 'bundle install' on my (OS X) development
machine.

Improve mobile UI pt2

Next UI elements were improved for mobile view

* comments
* comment form
* issues navigation
* removed duplicate MR sidebar btn
* tabs

Desktop improvements:

* increase comment author username font size
* dark colour for comment author name

Related to #1493

See merge request !1285

Disable Sidekiq arguments logging by default

Some of the arguments passed to Sidekiq jobs are secret. With this
change we avoid logging those secrets, by turning off 'argument
logging' altogether.

See merge request !1282

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	CHANGELOG

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Change twitter handle from gitlabhq -> gitlab

Username in comments

Its hard to mention person in comment if you don't know his username.
This patch show person username right after his name in comment row

See merge request !1281

HipChat custom server support

add preliminary 7.6 upgrade guide

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix internal api

Fixes #1787

See merge request !1280

Remove unused password argument

We no longer put a (random) password in the 'new user' email, so no need to pass it around in the code.

See merge request !1279

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

We were still passing a 'password' argument around, but it is not used
anywhere because we send a password reset link in the welcome email
nowadays.

Improve security release documentation

I think the MailChimp step is not needed anymore because we automated it.

See merge request !1271

Properly fix wiki restore

My previous patch didn't fix the restore issue (!247).

ProjectWiki.new() creates a new wiki git repository, so any tries to bare clone a bundle fail. With this patch we remove the newly created wiki.git before restoring from the backup bundle.

\cc @jacobvosmaer @dzaporozhets are you ok with this solution/hack?

Relevant issues: #845

See merge request !248

ProjectWiki.new() creates a new wiki git repository, so any tries
to bare clone a bundle fail. With this patch we remove the newly
created wiki.git before restoring from the backup bundle.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	CONTRIBUTING.md

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Reactivate highlight.js language autodetection

### What does this MR do?

This commit partly reverts commit 0d13abb1 to reactivate highlight.js language autodetection.

It does NOT revert the part that adds the `nohighlight` CSS-class for a predefined set of filenames (which was indeed the intended purpose of commit 0d13abb1).

### Are there points in the code the reviewer needs to double check?

Not particularly, the only effect of this blob_helper is to add a CSS class to the `<pre>` container of the blob, to control the way highlight.js performs its syntax highlighting. (see where this helper is called at https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/views/shared/_file_hljs.html.haml#L12).

However this merge request DOES change the way the syntax highlighting is done (by bringing it back to the situation before commit 0d13abb1 where highlight.js autodetected the language itself). So we can expect some new kind of syntax highlighting problems. However in this case, the issues should be forwarded to the upstream project (https://github.com/isagalaev/highlight.js).

### Why was this MR needed?

The main motivation behind this partial revert is that there is no point (IMHO) in using an "intelligent" syntax highlighter which is specifically designed to autodetect languages if it is to dictate (via the CSS class) the language to use solely based on the filename extension.

### What are the relevant issue numbers / Feature requests?

Issue #665 "HLJS language autodetection / syntax highlighting fails "

### Screenshots (If appropriate)

See screenshots in issue #665

See merge request !232

Fixed an alignment issue, fixes #778

This merge request fixes issue #778. I have figured out the problem already here: https://gitlab.com/gitlab-org/gitlab-ce/issues/778#note_366548

See merge request !242

Fix wiki restore

Seems 4a5044e3 only fixed git repos restore. This MR provides the same functionality that was introduced in the aforementioned commit, but for wikis.

See merge request !247

Make clear that the upgrader script does not update gitlab-shell

There are many cases where people end up with a broken update because they don't update gitlab-shell.

For example: https://twitter.com/hgomez/status/537902038907363330

\cc @sytses

See merge request !246

Create project & repository at the same time

* block project creation if repository cant be created
* show proper error message about failed to create repository
* dont use ajax for project creation any more - its fast enough
* if project repository does not exist - propose to create one or import
* move import functionality to separate resource

Fixes #1768

See merge request !1278

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>