Fix setup.py (pip can't install dependencies if __init__.py imports them)

Deleted all __init__.py imports. 
I'm sure this breaks code that does from `Quandl import *` but that shouldn't be done.
Not from Quandl import push, ... still works
My code works (which imports Quandl through ConcurrentPandas)
And my code can now deploy to heroku through codeship (both of which install dependencies using setup.py and pip)