Enable rack_attack by default.
Remove separate installation of charlock_holmes.
Merge branch 'no_separate_gem' of /home/git/repositories/gitlab/gitlabhq
Merge branch 'ra_default' of /home/git/repositories/gitlab/gitlabhq
Add specs for Email confirmation

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