Add full commit message to commit api as field message.
Merge branch 'add_complete_commit_message_to_api' of https://gitlab.com/christian.taedcke/gitlab-ce into christian.taedcke/gitlab-ce-add_complete_commit_message_to_api

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

Conflicts:
	CHANGELOG
Merge branch 'christian.taedcke/gitlab-ce-add_complete_commit_message_to_api'