Added "commits" to be redirected to build page. This URL is called from gitlab merge request page with a link next to the jenkins build status.

Furthermore added a logger warning to notify when a url is not matched.
Found that the id from the ObjectAttribute dit not point to the id of the merge request. In my cases the iid has the number of the merge request.

This commit adds the iid to the ObjectAttribute and changes the GitLabMergerCause description to us this instead of the id.
Merge pull request #34 from kasper-f/correct_gitlab_merge_number

Found that the id from the ObjectAttribute dit not point to the id of th...
Merge conflicts resolved
Merge pull request #33 from kasper-f/redirect_commit_to_build_page

Added "commits" to be redirected to build page.
Merge branch 'develop' of github.com:DABSquared/gitlab-plugin into develop
Merge remote-tracking branch 'parent/develop' into use-git-plugin-branch-data

Conflicts:
	pom.xml
	src/main/java/com/dabsquared/gitlabjenkins/GitLabWebHook.java