Python 3 support added; requests version check fixed.

I used 2to3 and manually remplaced 'compiler.ast' with 'ast' (since it has been dropped in Python 3 as a separate module).

Also, your 'requests' version check was incorrect (version 1.0.4 did not pass the check, though it clearly is higher than 0.8.8). A monkey patch applied to do it.