Update MergeRequest API state_event option documentation

Closes #25566

See merge request !8077

Add clarification to RC1 date

See merge request !9104

Rename issuable to IssueBase

See merge request !9127

Added header to protected branches access dropdowns

See merge request !8774

Allow copying a created branch name to the clipboard.

See merge request !9103

Responsive title in diffs inline, side by side, with and without sidebar

Closes #25709

See merge request !8707

Fix contribution activity alignment

Closes #27943

See merge request !9101

Add a spec for our custom GemFetcher cop

See merge request !9076

Upgrade to webpack v2.2.1

See merge request !9078

Fixes dropdown width in admin project page

Closes #27726

See merge request !9002

Adds a null check to build notifications

Closes #27948

See merge request !9108

Update the rspec_profiling gem to 0.0.5

Closes #27517

See merge request !9094

Upgrade from Babel 5 to Babel 6

See merge request !9072

oauth2.md: should use the provider's URL which is gitlab.example.com

See merge request !8173

Move 'User Snippets' Spinach feature to Rspec

See merge request !8574

Closes #27948

Update LICENSE to 2017

See merge request !9079

Refactored diff notes Vue app

See merge request !9065

Try to disambiguate the Bug issue template

Closes #27718

See merge request !9064

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

Drop support for Ruby 2.1

Closes #27251

See merge request !9098

Fix menu link in CONTRIBUTING

See merge request !9084

Update API docs for new namespace format

Closes #27730

See merge request !9073

It now relies on its Vue bundle rather than the window. Fixes some reactivity issues that was happening in EE

Correctly transform an anchor link to GFM when copying it

See merge request !9080