Remove guard, growl, rb-fsevent, rb-inotify

Addresses security issues in its rest-client dependencies:

- https://github.com/rest-client/rest-client/issues/369
- http://www.osvdb.org/show/osvdb/117461

Addresses security advisories:

- https://groups.google.com/forum/#!topic/ruby-security-ann/XIZPbobuwaY
- https://groups.google.com/forum/#!topic/ruby-security-ann/gcUbICUmKMc

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

    * Move existing Slack service spec into a subdir, mirroring /app
    * Wire up HipChat service to the project and services controller.
    * Split the message building into own class.
    * 'namespace' room and token variables.
    * Enforce v2 client (bug in HipChat gem v1.5.0. fixed in 1.5.1). Note
      that I'm using the same version string as GitLab-CE, for shared
      installations.
    * Defer execution to a notifier worker, like the Slack service.
    * Ensure passing specs (basically a Slack service spec copy, fwiw)
    * Added change to the CHANGELOG

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

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

* Added rails 4 binstubs with `rake rails:update:bin`
* Injected spring all of them with `spring binstub --all`
* Added Byebug for easier debugging

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

- Send notification at once for all commits

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>

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>

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

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