Added Python 3 compatibility

[BubaVV]

Now module support both Python 2.7 and 3.5+

[chadfurman]

@BubaVV Thanks, it installed without issue (had to pip3 install future and sudo python setup.py install -- that's it). I'm new to GAs so I won't be able to test it too much. But, if it works for my use-case that will be sweet. I'll report back either way.

[chadfurman]

Was able to make it through the first tutorial. Copying their "final code" and adjusting the print statement for python3 (lol) and it worked fine

[ranisalt]

@perone stop ignoring your repo

[perone]

@ranisalt if you think that a pull-request with 51 files changed, without testing implemented, will be merged fast, then you'll need to review what you think that an open-source contribution is. However, you are always free to implement testing for the project and submit a pull-request. But for that you'll have to invest more effort than what you did for the complaint =)

[lczyk]

@peronoe For testing I can recommend Travis CI.

[chadfurman]

Perhaps @ranisalt will test it for us :)