Add git aliases for git qa and git qa-tidy

Adding default git aliases for git qa and git qa-tidy
Example usage:
git qa 12344
git qa-tidy 12344

What they do:
git qa <bugnumber>
Checks out master
Fetches origin/master
rebases origin/master
Checks out a branch: qa-12344 based on master
Fetches the patches from bug 12344 from bugzilla and attempts to apply them.

git qa-tidy <bugnumber>
checks out master
deletes the qa branch associated with <bugnumber>
Merge pull request #43 from wizzyrea/master

 Add git aliases for git qa and git qa-tidy