Bug in issue and merge request filtering

Fixes #1006

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

fixed h3, h4 font-sizing for gitlab-flavored markdown (solves issue #6211)

refactor omniauth configuration method

Fix broken merge request select

Fixes #991

Merge request target branch select is broken if you submit form and have
some errors on 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>

Fix shifting line numbers.

When there are 1000 lines or more in a file, the link icon causes the numbers to shift down a line when you hover over the line number. This fixes that issue by setting a `nowrap` option for the line number anchor tag.

I also removed the fixed width of 60px for the `line-numbers` div as this causes issues for longer line numbers. I used `visibility: hidden` instead of `display: none` to ensure that the space for the link icon is taken into account. This way auto sizing the div does not cause any problems.

You can see the current behavior by looking at the following:

https://gitlab.com/gitlab-org/gitlab-ce/blob/master/vendor/assets/javascripts/ace-src-noconflict/mode-java.js

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

Remove Pygments.rb

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>

An architectural overview of GitLab

UI Fixes

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

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

Nicer 502

Add comment about tls for ldap method

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

Fix relative links in markdown. Related to #6182