Replace `link_to_gfm` with `link_to` in merge request and issue titles.

## What does this MR do?
This removed GitLab Markdown Formatting from issue titles due to issues and confusion it caused as well as performance reasons.

On the issue/MR page itself, the formatting is preserved. This only effects index pages. See:

![Screen_Shot_2016-05-24_at_3.31.17_PM](/uploads/8857ed7f3cc6a47ea41ca88134e5d17a/Screen_Shot_2016-05-24_at_3.31.17_PM.png)

I think the trade-off here is worth it, otherwise we'd just be playing wack-a-mole.

## Are there points in the code the reviewer needs to double check?
I don't think so.

## Why was this MR needed?
Previously if an issue had an emoji for its name it would be unclickable. Similarly, links were rendered inline if the title was something like “Fixes a bug with https://google.com”. This confused a number of users, so it’s removed.

This is also ever so slightly more performant :)

## What are the relevant issue numbers?
This fixes #17614 and #17230.

## Screenshots (if relevant)

Before:

![Screen_Shot_2016-05-24_at_3.19.52_PM](/uploads/25313af3d3995a096b7bad7c5a26d071/Screen_Shot_2016-05-24_at_3.19.52_PM.png)

After:

![Screen_Shot_2016-05-24_at_3.20.13_PM](/uploads/f14f09918001bcbac2cd939b016479b2/Screen_Shot_2016-05-24_at_3.20.13_PM.png)

Before:

![Screen_Shot_2016-05-24_at_3.20.48_PM](/uploads/c183ae2c491650c328eb5768f6a55fd9/Screen_Shot_2016-05-24_at_3.20.48_PM.png)

After:

![Screen_Shot_2016-05-24_at_3.20.42_PM](/uploads/d3431a691768bae2c5244b9b632061b9/Screen_Shot_2016-05-24_at_3.20.42_PM.png)

cc: @rspeicher @jschatz1 

See merge request !4284

Fix right sidebar expand/collapse issue

Fixed branch name of the !4117


------------------

Fixes #15643 

- Fixed a typo in `toggleSidebar` method of `Sidebar` class.
- Fixed a minor styling issue to fix the sidebar to the top of the page.
- Added tests for Sidebar.


## Before
![before](/uploads/c4efe9a64e0ae35f423302753caa6dfd/sFBwnVEpQB.gif)

## After
![after](/uploads/23e6b80888dae475a385912c8c40bdbd/rerKiYC4dk.gif)


See merge request !4292

POC: Updated contrib calendar

In an effort to cut down the JS file size - i've removed the heatmap calendar used for the contributing calendar on users profiles. We already have d3 on the page so why not use it instead of using a library which uses it?

![Screen_Shot_2016-04-27_at_11.08.41](/uploads/64c40f0c766f800fd0e33ac8be7f9644/Screen_Shot_2016-04-27_at_11.08.41.png)

cc. @jschatz1 

See merge request !3944

Mobile navigation fade out

Closes #17339     
Closes #17610  

<img src="/uploads/e382dd363bf8beb28339fa6b152be092/Screen_Shot_2016-05-18_at_10.16.59_AM.png" width="400px">


See merge request !4195

Update state_machines-activerecord from 0.3.0 to 0.4.0.

Includes support for Rails 5, working towards #14286.

See merge request !4295

Add fade out to left side of layout nav; remove dropdown nav helper; remove controls button from mobile

Add new HA diagrams [ci skip]

## What does this MR do?

Adds new HA diagrams created by @lukebabb (Thanks @lukebabb!)

See merge request !4289

No changelog, see commits: https://github.com/state-machines/state_machines-activerecord/commits/master

Includes Rails 5 support.

Fix RuboCop

See merge request !4294

New confirmation email

See merge request !3354

[ci skip]

This makes it easier to debug style rules.

Remove `issue_to_atom` helper



See merge request !4265

Improve design of Pipeline view

## What does this MR do?

Improves current design of Pipelines view when there is multiple stages.
This makes the statuses clickable and makes the view more compact.

## Screenshots (if relevant)

![Screen_Shot_2016-05-21_at_01.20.40](/uploads/dd031b7af7005c7a61f3165fefa8b7c9/Screen_Shot_2016-05-21_at_01.20.40.png)

cc @DouweM @markpundsack @rspeicher @marin 

See merge request !4230

Remove `event_to_atom` helper



See merge request !4234

Fix for import URL URI problem when URL contains a space

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/17559

Prevents an already encoded URL to be encoded again - preventing %20 => %25%20

See merge request !4180

Fix forks creation when visibility level is restricted

fixes #10725

See merge request !4283

Updated error message when project limit is zero

When the project limit is zero & the user tries to create a project, the
error displayed is now 'Personal project creation is not allowed. Please
contact your administrator with questions'

Closes #17691

See merge request !4280

Fix groups API to list only user's accessible projects

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/17496

See merge request !1966

Related merge request text alignment

Fixed the alignment of the text 'When this merge request is accepted...' on issues page

![Screen_Shot_2016-05-23_at_14.59.48](/uploads/5d2f4be94108364a9d004169a6825a9e/Screen_Shot_2016-05-23_at_14.59.48.png)

See merge request !4251

[ci skip]

Write some thoughts to the UI guide

cc @skyruler 

See merge request !4290

Issuable filtering improvements

This improves the filtering of issues and merge requests by creating a single file that encapsulates all the filtering. Previously this was done with a file for issues and a file for merge requests.

Created the ability for the text search to be done alongside other filterables. Previously because this was outside the filterable form, this wasn't possible and would instead do either filter dropdown or text filter - not both. Fixes #4252 

Fixed issue with not being able to filter and sort issues without refreshing the page. Fixes #15269 

See merge request !3699