Minor bug fix/styling with server cgi scripts

I like pep8, okay?
The current live version of feedback.py has some fixes, so porting them here.
Merge branch 'master' of github.com:CSSE1001/MyPyTutor

# By Peter Robinson
# Via Peter Robinson
* 'master' of github.com:CSSE1001/MyPyTutor:
  upgrade to use ast
  an example of the update to ast