Merge pull request #28 from wmantly/brendan

updated rpn.expression and rpn solution in controller.py from previous n...
changes
Merge branch 'master' of https://github.com/wmantly/RPN-game into benny
debugging
no folder
getting rid of .sql
Merge pull request #30 from wmantly/benny

Benny
Merge pull request #32 from wmantly/master

changes from branch into master