More performance improvements for large groups

* fetch team members using much less sql queries
* collect mentioned users without iterating over all project users

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

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

Performance improve

Fixes #1315.
For group with 500 users it reduce amount of sql queries from 500 to 20.
It reduces page load ~ 3 times or even more. For larger group it will be even more difference

Improve MR tabs UI/UX

![Screenshot 2014-06-04 12.29.19](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/b75785b28f/Screenshot_2014-06-04_12.29.19.png)

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

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

Fix 500 on labels page

Broadcast 3 digit colors

This commit fixes a lot of sql queries to db for for groups and projects
with big amount of members.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fixing typo in help for public access

Fixing a typo in the help page

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

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

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

Update patch release document

Upgrade to rails 4.1

Update docs to match new markdown style guide 2

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

project: ci_service should only catch ci services

Chrome app

ci_service should return true if a ci service is enabled.  Currently
it's checking for any service being enabled instead of only services in
the ci category.

Same origin header

Fixes #1313

Case insensetive search

Fixes #1258

cc @marc

Ui improvements

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

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

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

Remove artifact

This commit 07a9d44d caused letter a to be shown 72 times when the commit is being edited, removed that.

Ui improvements

This reverts commit 754b0838.

Sidekiq rendered via mounted sinatra app. We don't need to change
controller headers. It won't affect sidekiq at all. Please modify nginx
config instead for all gitlab app.