Fix missing to on reassign Merge Request text email to unassigned.

Factor new issue and edit MR forms.

API: Filter issues by labels

While working on [laboard](https://gitlab.com/jubianchi/laboard) I had some issues with the API : I was not able to filter issues by labels so I had to write some logic to do it on my side.

I think it will be useful to have this feature supported by the Gitlab API.

I added the filtering logic on `/issues` and `/projects/:id/issues`.

The commits are not squashed but I'll do it once everything seems ok to you.

See merge request !169

Validate branch/tag-names and references WebUI, API

Fix missing to on reassign Merge Request email to unassigned.

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

Conflicts:
	CHANGELOG

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

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

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

update repo recreation details

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

Improve issues filtering textfield

* make issue filter work visible
* update browser url so after page reload I don't loose my filter
* don't send a lot of requests - let user stop typing
* make tests finally pass!!!

See merge request !1063

Hooks migration

See merge request !1061

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

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

Internal api post

See merge request !1059

Add specs for GitRefValidator

Add system hook for ssh key changes

Fix branch remove for branches containing a '/'

Add users with deterministic username and password to development seed.

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

Conflicts:
	spec/lib/gitlab/oauth/user_spec.rb

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

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

Factors out text MR and issue email.

Add system hook for ssh key create and destroy
Update and fix documentation
Update tests

Mention [skip ci] in CONTRIBUTING.md.

http://docs.travis-ci.com/user/how-to-skip-a-build/

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

Rename Activity to Project tab

Fixes #1544

See merge request !1058

Modify GitLab to work with gitlab-shell 2.0

Related to #1516

See merge request !1057

'all' is not a valid username

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

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