Import print_function for ST2 compatibility

Fixes bug that caused the Open Ipython Notebook command to not show up on ST2
Merge pull request #7 from sloria/fix-print

Import print_function for ST2 compatibility
fixes for package control
fix for ST2
use proxy opener, memorize last used base URL
experiment: treat text cells as latex
fix some bugs, LaTeXTools should work inside Markdown cells
also add source.python and source.r, probably fixes #11
fix default address
Merged with maximsch2 main repo