It doesn't seem possible to set constraints based on format for project
IDs ending in .git, so set the constraint on the ID and ensure the
format is nil to avoid the case where the project ID is something like
project.git.foo.

Shows award emoji for comments to all users who are logged in.

## What does this MR do?
Fixes the award emoji picker not showing up for users who weren't able to edit another user's comment.

## Screenshots (if relevant)
Before:

![Screen_Shot_2016-06-08_at_5.18.04_PM](/uploads/a8b40ba319481f53d55de055d84649b9/Screen_Shot_2016-06-08_at_5.18.04_PM.png)

After (logged in):
![Screen_Shot_2016-06-08_at_5.16.16_PM](/uploads/535edcca6fbdd8834beda39399f85384/Screen_Shot_2016-06-08_at_5.16.16_PM.png)

After (logged out):
![Screen_Shot_2016-06-08_at_5.15.08_PM](/uploads/7f0dff751714c7d20f78b56893cacd59/Screen_Shot_2016-06-08_at_5.15.08_PM.png)

cc: @fatihacet 

See merge request !4547

Show loading indicator for autocomplete

![autocomplete](/uploads/397df34689aeb5f4cbca99aea209c8cf/autocomplete.gif)

Closes #15435

See merge request !4182

#17284 Edit form does not cancel correctly

## What does this MR do?

Replaces the markdown textarea with the currently saved note text when the note edit is cancelled.

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

No

## Why was this MR needed?

Allows the user to revert back to the original note text, as expected, using cancel.

## What are the relevant issue numbers?

Fixes #17284.

## Screenshots

![17284](/uploads/c3598de6f8e70d52275ef25907d92d42/17284.gif)

See merge request !4175

Side nav scrolls if content height taller than screen

## What does this MR do?
Header logo is now fixed at top; put back scrolling functionality in side nav

## Screenshots (if relevant)
<img src="/uploads/e1d1b60c296c39c61d7fe7da22b6c52d/scroll.gif" width="600px">

See merge request !4513

Disable CSRF protection when serving Git HTTP clients

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18331

See merge request !4538

Add new icons in left sidebar and layout nav

Closes #17609    
Closes #17240    
Closes #17321    

![Screen_Shot_2016-06-02_at_8.47.38_AM](/uploads/f254fe81cba65cbdeb8e5720f0b2fc19/Screen_Shot_2016-06-02_at_8.47.38_AM.png)
![Screen_Shot_2016-06-02_at_8.53.33_AM](/uploads/2c27284f0a4916fe447794d9b663c4df/Screen_Shot_2016-06-02_at_8.53.33_AM.png)

@skyruler I couldn't find the icons for `Projects`, `Merge Requests`, `Snippets`, or `Help` in the design repo. Do you have them available somewhere?

See merge request !4268

Use container helper instead of hard coded container

## What does this MR do?
Add `container_class` helper class to fix layout bug

## What are the relevant issue numbers?
#18333 
## Screenshots (if relevant)
Fixed:    
![Screen_Shot_2016-06-08_at_2.03.38_PM](/uploads/6e7575d711efb8eaf6ba641907b2d607/Screen_Shot_2016-06-08_at_2.03.38_PM.png)
Fluid:     
![Screen_Shot_2016-06-08_at_2.03.56_PM](/uploads/33d3f73781ca9ed129f853abfe9feb4b/Screen_Shot_2016-06-08_at_2.03.56_PM.png)

See merge request !4543