More Documentation

Hi Takafumi @tkf

So I started the process of modifying the documentation. I hope this is helpful and I plan on providing a bit more as time permits. 

In this version, I just wanted to clear up the difference between Jedi.el --> Jedi.py and Emacs-Epc --> Python-Epc. Hopefully that was accomplished. I am no Emacs wizard and I am thankful that YOU are willing to provide this awesome stuff! Thank you! 

Please let me know if this is crap and where I can improve or change it. I have thick skin ;^)

@MichaelMartinez