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

Adds the markdown link at the cursor poisition

When writing a comment and then dropping an image it will correctly add the image markdown link at the cursor position

![drop-image-markdown](/uploads/52f41e38faca48c9ee01a02a75ec71be/drop-image-markdown.gif)

Tested in Chrome & Firefox and both working fine :thumbsup: 

Fixes #12822 

cc. @jschatz1 

See merge request !2648

Added dropdown to list all projects on project header

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/4212

When clicking the current project name, it shows a dropdown menu with a list of all projects for that group or user.

When closed:

![Screen_Shot_2016-01-14_at_19.17.44](/uploads/a7258ba388dba238fc2f0468711fc729/Screen_Shot_2016-01-14_at_19.17.44.png)

When open:

![Screen_Shot_2016-01-14_at_19.17.51](/uploads/716533d9eb44b123c5fdff36a4740489/Screen_Shot_2016-01-14_at_19.17.51.png)


cc. @jschatz1

See merge request !2438

First, the autosize library was being too controlling and removed the
`resize` property from any elements to which it was attached, removing
the drag handle.

Second, we detect when the user manually resizes an autosize textarea,
and then remove the autosize behavior from it and increase its
max-height.

This should allow for the best of both worlds.

Closes #12832