Fix missing assigned_to renaming in 2e839ce

fixes #4360.
[Doc] Update 5.0 to 5.1: Recompile assets

Recompiling assets on the update is needed or main menu appearance may not load properly. This has been mentioned on issues #3722 and #3978.

The command has been tested several by users on those issues and by myself.

Thanks for your time and attention.
Rename unspecified to make it clearer and in line with scrum terminology.
Add animated screenshots.
Merge pull request #4369 from zeehio/patch-1

[Doc] Update 5.0 to 5.1: Recompile assets
Notes about what PR's we would like to see.
cattr_accessor removed from IssueObserver and MergeRequestObserver but not updated in fixtures
Merge branch 'master' of github.com:jackbot/gitlabhq
Merge pull request #4407 from jackbot/master

Database seeding failing
Show participants on issues, including mentions, and notify email to all participants
Merge pull request #3898 from jacargentina/notifymentioned

Notify email to mentioned users; show participants ala github on issuables
we should not use `console.log` in production code...
Merge pull request #4410 from senny/dont_console_log_in_code

we should not use `console.log` in production code...
Detail gem update policy.
fix bad constant reference in `project_routing_spec.rb`.
Merge branch 'animated-gif' of /home/git/repositories/gitlab/gitlabhq
Merge branch 'gem-update-policy' of /home/git/repositories/gitlab/gitlabhq
Merge branch 'contributing-pull-requests' of /home/git/repositories/gitlab/gitlabhq
whitespaces in gitlab.yml.example
Merge pull request #4361 from kenips/master

Add missing assigned_to renaming to merge_requests_load_context