PEP8 Codes Added

All of the PEP8 codes have been added with explanation directly from the PEP8 documentation. By uncommenting, these errors can be disabled.

I originally made this for SublimePythonIDE. But since it's no longer in active development, why not make a pull request here (too)?
https://github.com/JulianEberius/SublimePythonIDE/pull/69