Switch to Python relative imports

Added __init__.py in main repo directory so that it works as a Python package
now.

All "from Anaconda.xyz import"s switched to "from .xyz import".
(With one exception: jsonclient.py import from "..").

Unresolved: hardcoded paths in Main.sublime-menu and other Sublime files.
No idea how to fix 'em.
Merge branch 'master' of git://github.com/pbanaszkiewicz/anaconda into pbanaszkiewicz-master