Note on git blame in GitLab in tips lecture

They have either been implemented or filed as an issue on GitLab.

Updates martijn

Jfjlaros 2014

Updates bow

Slight delay because yesterday some things took more time than I predicted..

But I think the tips presentation is ready now :). I added the git-prompt.sh file (which comes with a git install) to the repository just to be sure we have a backup in case the file is not available in the laptops.

Other than that, I skipped the autocrlf / safecrlf config since it seems more complicated for first-time git users. Instead, I added some slides about `git add --patch` for selective commits of line changes, which I think is more useful (and easier to grasp).

Anyway, comments are welcomed.