Add placeholder values to hipchat service

This MR adds placeholder values to the hipchat service.
This should prevent issues like #279 or #772 that popped up because people didn't know what exactly they are supposed to enter in the fields.

See merge request !294

Add syntax colors to diffs in email-on-push notifications

## What does this MR do?
This MR adds syntaxhighlighting to the email-on-push notifications.
## Are there points in the code the reviewer needs to double check?
No
## Why was this MR needed?
Currently the diff in email-on-push notifications is just a monochrome diff that's hard to read.
This MR adds colored syntaxhighlighting to the mails.
## What are the relevant issue numbers / Feature requests?
* It closes https://github.com/gitlabhq/gitlabhq/issues/6994
* There is a Discussion in the Feedback Forum: http://feedback.gitlab.com/forums/176466-general/suggestions/5802256-add-color-to-diffs-in-email-on-push-service-to-htm
* A pull request for this already existed, but was closed. https://github.com/gitlabhq/gitlabhq/pull/7739

## Screenshots
see prior Pull Request for a screenshot

See merge request !295

Make search for projects case insensitive

### What does this MR do?

This MR makes the search for projects case insensitive.

### Why was this MR needed?
Currently the search for projects is case sensitive.
You can test this on gitlab.com with the search string "perforce" for example.
* perforce returns 2 projects
* Perforce returns 5 projects
* PERFORCE returns 0 projects

This makes it harder to find the projects you are looking for.
With this MR users can find more projects, since they don't need to worry about not seeing some projects just because of an upper letter.

@dblessing Can you take a look at this? :)

See merge request !296

Fix sort dropdown partially not showing on screen.

This MR fixes the sort dropdown menu partially not showing on the screen.
Closes gitlab-org/gitlab-ce#986

Screenshot of the Problem:
![Problem](https://gitlab.com/uploads/gitlab-org/gitlab-ce/8d442e872c/Screenshot_from_2015-01-17_15_18_41.png)

@dzaporozhets Can you take a look at this?

See merge request !299

Remove unneeded password_confirmation from seed.

Stability improvement

Add description attribute to group API (GET and POST)

Add krb5 dependency for packaging

Typo in project API events comment

Update gitlab-shell in docs to 2.4.1

Add description to merge request API documentation

See merge request !301

The description can be provided when creating or updating a merge
request.
Signed-off-by: Loic Dachary <loic@dachary.org>

Fix commits pagination

See merge request !1406

see gitlab-org/gitlab-ce#986

Update import doc

Documentation update for #1900

See merge request !1405

Allow to specify home page for non logged-in users

See merge request !1404