* Added rspec tests for #skip_ref?
* Allow regex matching
* Added hints on Project form

Rename hostname to description in Runner's API

Continuation of: https://gitlab.com/gitlab-org/gitlab-ci/merge_requests/28

See merge request !34

Allow to receive tag_list from Runner

This enables CI to receive tag_list from Runner's during registration.

Test results are here: https://semaphoreapp.com/ayufan/gitlab-ci/branches/tag_list

This MR requires gitlab-org/gitlab-ci-runner!11

See merge request !32

Doc update

See merge request !111

Documentation update

See merge request !110

#98 Updated documentation with callback URL details.

See merge request !33

Redesign services

I'm just copycat here, but it looks really nice.

![Screen Shot 2015-01-24 at 12.14.02](https://gitlab.com/uploads/ayufan/gitlab-ci/c5cf8c4f75/Screen_Shot_2015-01-24_at_12.14.02.png)

See merge request !31

Taken from:
- a6bdf7d8769c1726084f42a510b6aed097fffbf2
- 5e98293b0e21a7fd9d62ce7272afef31b8414abb

Api doc fix

See merge request !109

Disable retry for old build

https://gitlab.com/gitlab-org/gitlab-ci/issues/87

See merge request !108

Fix OAuth redirect URLs with GitLab using relative_url

### What does this MR do?

This MR fixes URLs used for oauth authentication - current implementation will only with with GitLab instance if it does not use relative_url.

### Are there points in the code the reviewer needs to double check?

No

### Why was this MR needed?

In case of relative_url GitLab installation, OAuth links were removing the relative path part. It was caused by incorrect configuration of OAuth2::Client class.

### What are the relevant issue numbers / Feature requests?

I couldn't find any related issue

See merge request !26

Fixed broken can_test for Slack notifications

Small bug I noticed during e-mail notifications rework

See merge request !29

Receive hostname

Coordinator consumes Runner's hostname and uses it's as a description during registration.

This MR is required to make it work:
https://gitlab.com/gitlab-org/gitlab-ci-runner/merge_requests/10

See merge request !28

Added OAuth2 section to update doc

See merge request !107