Add documentation for HipChat integration

This was a source of confusion here:

https://github.com/gitlabhq/gitlabhq/issues/7373

See merge request !393

Auto config git if user forgot

If git is not configured properly, let gitlab:check try to fix it by executing the commands itself instead of outputing how the user could fix it.

If this fails the error is still displayed.

Edit;
Not yet added to the CHANGELOG as;
* Im not really sure this fits in the scope of a test
* No clue how to test this properly

See merge request !383

Use same layout and interactivity for project members as group members and make code more consistent.

It's probably easiest to review the commits one by one, but keep in mind that later commits sometimes touch the same place as earlier ones, so look at the complete diff to add comments.

The project members page and group members page now look and work the same, with an inline "Add members" form, member search and editing of access levels and deleting without page refresh.

Before:

![Screen_Shot_2015-03-13_at_16.50.39](https://dev.gitlab.org/gitlab/gitlabhq/uploads/2cd023c48de0a643ce04df965f39e1f5/Screen_Shot_2015-03-13_at_16.50.39.png)

After:

![Screen_Shot_2015-03-13_at_16.50.02](https://dev.gitlab.org/gitlab/gitlabhq/uploads/fdef480daf2859ed74f5641af1f337b3/Screen_Shot_2015-03-13_at_16.50.02.png)

See merge request !1695

Use pre-wrap for diff code in discussion view

This prevents merge request comments from being hidden in discussion view.  See #2017.

### Before

![diff_comment_before](https://dev.gitlab.org/Okada/gitlabhq/uploads/e6d24987b8d88f4e8a5883645d569b56/diff_comment_before.png)

### After

![diff_comment_after](https://dev.gitlab.org/Okada/gitlabhq/uploads/fc035f9fc44718dc8424d3f8b54f0953/diff_comment_after.png)

This change doesn't affect the "Changes" tab:

![diff_view_comment](https://dev.gitlab.org/Okada/gitlabhq/uploads/9975d4c3feac629d6a0d76b5a0ef43d8/diff_view_comment.png)

cc @sytse

See merge request !1700

Fix typo

Restyle import

Render import providers in one line and make it buttons

See merge request !1699

More flatly

* use sass variables for repeating colors
* use more of Flatly theme variables
* refactor buttons

See merge request !1698

Unblock user if they were unblocked in AD.

Fixes problem with !1687.

See merge request !1694

Fix typo in CHANGELOG.md