Fix specs after change to gitlab-test to account for new branch

Also, when verifying the last commit on master search for the branch by name, instead of counting on it being the last branch, to be more resilient to future changes on gitlab-test

Closes #29 (closed)

Mentioned in merge request !131 (merged)

Mentioned in commit 0cd94c0f

Status changed to merged

Mentioned in commit 1aab7c04