Fix broken tests

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

cc @DouweM 

See merge request !2708

Fix atom url issue on projects

This MR adds prevents a project to have a path ending in .atom that conflicts with the feed

and 

Adds a migration to migrate old .atom projects to a different path

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/3699

See merge request !2651

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

Hide remove source branch button when new commit is added to branch

Fixes #3339

This MR hides the 'Remove source branch' button when a new commit is added to the source branch

/cc @DouweM

See merge request !2701

Fixes #3339

This MR hides the 'Remove source branch' button when a new commit is added to the source branch

Make Pipelines responsible for defining their custom whitelist

This allows for future pipelines to more easily define a custom
whitelist.

See merge request !2693

No space required after WIP identifier

Fixes #2426 

Currently, the WIP: (or any other variation) prefix of a merge request title must include a trailing space for it to be recognized as a work in progress and prevent merging. 
To resolve this, I added an or pattern to the regexp to look for any one of the three possible delimiters ':', ']', or ' '. This way the trailing space isn't required but it still won't mark any titles beginning with wip as work in progress (e.g. "Wipwap").

See merge request !1876

This allows for future pipelines to more easily define a custom
whitelist.