Support hooks on merge requests

[saraf]

Capability for merge requests in gitlab to trigger strider jobs. (like github pull request and travis)

There is a merge_request_events parameter in the API call for adding hooks.

http://doc.gitlab.com/ce/api/projects.html#hooks

Add project hook

Adds a hook to a specified project.

POST /projects/:id/hooks

Parameters:

    id (required) - The ID or NAMESPACE/PROJECT_NAME of a project
    url (required) - The hook URL
    push_events - Trigger hook on push events
    issues_events - Trigger hook on issues events
    merge_requests_events - Trigger hook on merge_requests events
    tag_push_events - Trigger hook on push_tag events

[vijayrawatsan]

+1