Add @project variable to merge request emails

After this change project name appears in the top part of email when you
open/close/accept merge request.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Style devise error messages

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Improve email with confirmation instructions

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Add resend-confirmation-link to sign-in page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Improve UI/UX for reset_password, signup, confirmation pages

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'feature/project_in_mr_emails' of /home/git/repositories/gitlab/gitlabhq
Fixed the no_avatar.png path

Fixes: https://github.com/gitlabhq/gitlabhq/issues/4394
Merge branch 'improve/devise_ui' of /home/git/repositories/gitlab/gitlabhq
Merge pull request #5862 from jvanbaarsen/patch-1

Fixed the no_avatar.png path
Fix tests

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Add 6.4 entries to CHANGELOG

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Added dropdown menus to issue#show page for assignee and milestone