Untrack all .rpyc and .rpyb files

The .rpyc and .rpyb files are generated automagically by Ren'Py, so they
shouldn't be tracked by this repo.
Untrack all files in tmp/

The files were ignored, but never removed from the repo, so now
I've gone ahead and untracked them.
Ignore game/saves directory
Merge pull request #2 from ARMIGER1/ignore_files

* Untrack auto-generated files
* Untrack tmp/*