WORKFLOW: Added sections regarding PDB and PEP8
WORKFLOW: Added sections regarding PDB and PEP8

* Added more advanced testing commands
    - The exercises on exercism are good for practicing pdb, and I thought it would be beneficial to give a plug on using debuggers.
    - PEP8 is a common nitpick, and this would test for it before submission. I felt it should be encouraged, but optional.

smalley/python,outkaj/xpython,jmluy/xpython,de2Zotjes/xpython,jmluy/xpython,pombredanne/xpython,rootulp/xpython,N-Parsons/exercism-python,behrtam/xpython,oalbe/xpython,pombredanne/xpython,behrtam/xpython,exercism/xpython,ZacharyRSmith/xpython,rootulp/xpython,exercism/python,N-Parsons/exercism-python,ZacharyRSmith/xpython,wobh/xpython,mweb/python,wobh/xpython,outkaj/xpython,smalley/python,exercism/xpython,Peque/xpython,mweb/python,pheanex/xpython,Peque/xpython,exercism/python,de2Zotjes/xpython,orozcoadrian/xpython,orozcoadrian/xpython,oalbe/xpython,pheanex/xpython