Disable changing of target branch in new merge request page when a branch has already been specified

Closes #1830

Fix 403 Access Denied error messages when accessing Labels section in a project

This occurs when MRs are enabled but issues are enabled

Closes #1813

See merge request !842

Fix 403 Access Denied error messages when accessing Labels section in a project that has MRs disabled but issues enabled

Closes #1813

"Fix behavior of ldap_person method in Gitlab::OAuth::User" for 7.12

See !837

See merge request !840

Fix behavior of ldap_person method in Gitlab::OAuth::User

Code tweaks in 45e9150a caused the ldap_person method to not return expected results.
Improved tests to cover the ldap_person method, which was previously stubbed.

Restored the previous implementation of ldap_person, as I could not find a more concise to write it that still works with all the test cases.

See merge request !837

Backport custom dashboard

This is a backport of !778 without the `Gitlab::Themes` refactor for the 7.12 branch.

See merge request !828

Bump rails to 4.1.11, jquery-rails to 3.1.3 for stable

See merge request !832

Bump rails to 4.1.11, jquery-rails to 3.1.3

rails 4.1.11 notes - http://weblog.rubyonrails.org/2015/6/16/Rails-3-2-22-4-1-11-and-4-2-2-have-been-released-and-more/

jquery-rails < 3.1.3 security advisory: https://groups.google.com/forum/#!topic/ruby-security-ann/XIZPbobuwaY

See merge request !830

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Also converts doc/README.md to Unix line endings

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This controller is now the target for `root_url`. It sub-classes
DashboardController so we can render the old default without a redirect
if the user hasn't customized their dashboard location.

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It was only used for the appearance live updating, which is now handled
by Profiles::Preferences#update

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Kerberos require to stable 7.12

!819 to 7-12-stable

cc @jacobvosmaer

See merge request !827

If kerberos is enabled require it

Since 'group: :kerberos' got [included in the Gemfile ](https://gitlab.com/gitlab-org/gitlab-ce/commit/2391a43a7073b4e723e9ca1f7ff19b30f8e51452) Kerberos no longer got [loaded when the app started](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/config/application.rb#L6)

This caused `Devise::OmniAuth::StrategyNotFound` error once Kerberos is enabled, failing to start GitLab .

With this we hopefully do not need to remove group from the Gemfile.

See merge request !819

Fixes for RC2

we need it to make GitLab works with new CI

cc @jacobvosmaer

See merge request !1864

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

Look for .gitlab-ci.yml only if checkout_sha is present

Fixes https://dev.gitlab.org/gitlab/gitlabhq/issues/2396

cc @vsizov

See merge request !818

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