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

Fixed dropdown link line-height

## What does this MR do?

Fixes line-height issue on dropdown menu links

## Why was this MR needed?

The line-height of some dropdown links were taking the parent, most noticeable the commit header

## Screenshots (if relevant)

Before:

![Screen_Shot_2016-06-08_at_12.26.13](/uploads/51d6bbb4d727da0e3f27d715d6556d4f/Screen_Shot_2016-06-08_at_12.26.13.png)

After:

![Screen_Shot_2016-06-08_at_12.25.03](/uploads/2dcbfaa67982500eef42cfe4247cd54d/Screen_Shot_2016-06-08_at_12.25.03.png)

See merge request !4531