add --binary option and ability to open .gz and .bz2 input files

[travisbrady]

Hi Bryan,

Thanks for DeepWalk. I was pleased to see a real useable implementation released with the paper.

I wanted to test DeepWalk a bit but I typically gzip my data files so I added support for that and also the ability to save the resulting model to word2vec's (more compact) binary format. There is also a bit of whitespace cleanup in graph.py

Let me know if you see any issues here. Travis

[travisbrady]

Pardon me, just tested the binary option and it throws an Exception. Pause on this.

[phanein]

Hey Travis,

Good feature idea, thanks for the patch. I'm in a little bit of a crunch right now, but I can look closely at this sometime in the next week or two if you don't get back to it first.

B