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.

@w.arindrarto I'm now going to merge your changes and upload your slides and handouts to the website. If these files need updating later, please let me know or upload them yourself.

Oh I agree with your choice for git add -p instead of line ending magic. I'll go over your slides and let you know if I think anything needs changing. Thanks!

Great, thanks :)!