s/was/were/ for plural subjects

Merge branch 'feature/refactoring_scopes_pr' of https://github.com/Undev/gitlabhq into Undev-feature/refactoring_scopes_pr

Conflicts:
	db/schema.rb

Install gems with user `git`, not `gitlab`

Fixed JSON description of system hook

- remove admin kaminari theme. Use gitlab theme everywhere
- use bootstrap styled for gitlab admin themes
- dont reload page when change issue filter

Fixed JSON description of system hook to accurately describe what is actually being sent.