check upload dir permissions

Add size information back to project summary screen.

![gitlab-with-size](https://gitlab.com/nneul/gitlab-ce/uploads/84d15169aa7ee4e966465a71ca383f24/gitlab-with-size.png)

See merge request !1178

Fix blame view line groupings

Before:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/b84f75183244e58683b9172c772591d6/image.png)

After:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/12ef635deefd3616142e65f064252020/image.png)

Closes #2305

See merge request !1176

Navigation improvements

- [x] make explore area as part of dashboard
- [x] move navigation links from top right corner to sidebar
- [x] group navigation items on dashboard
- [x] cleanup UI after such changes
- [ ] fix tests

cc @sytses @JobV

See merge request !1177

Feature/control import options

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>

* projects from explore page are available from dashboard
* use dashboard sidebar for both logged in and not users
* move explroe projects under projects tab
* move explore groups under groups tab
* move public snippets under snippets tab
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

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

Closes #2305

Improved 2FA warning message about lost codes

Fixes internal issue: https://dev.gitlab.org/gitlab/gitlabhq/issues/2472

The warning message now clearly states that access will be lost of the 2FA recovery codes are not saved.

/cc @sytses @JobV

See merge request !1175

Feature/search for archived projects

Resolves #9285

Added note about backing up recovery codes

Several people have tried to recover their 2FA codes. I think we could be more clear about it in the docs.

This is why I added a section about it at the top, so they read it before enabling them.

https://twitter.com/deathgreps/status/632006221814464512
https://twitter.com/benniemosher/status/633768429313372160

See merge request !1923

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

add CommitNote field expose :created_at

add CommitNote field expose :created_at

Make sure blog post MR has WIP keyword

cc @sytses @rspeicher

See merge request !1172

Fix path traversal in HelpController

Closes #2543

See merge request !1922

Fix infinite loop when SAML was incorrectly configured.

See merge request !1170

Fix gitlab:env:info rake task.

Found doing QA.

See merge request !1169

Clear cache to prevent listing deleted branches after MR removes source branch

Closes #2272

See merge request !1160