Replacing urllib2 with Requests library for downloading

[schlamar]

This will fix

• Issue w/ proxy connection, not sure what else to try #87
• ST2 won't go through my Proxy #93

and probably every other SSL/Proxy/Download problem currently issued.

It is about 10 times faster than the former downloader (subjective opinion). Furthermore, this will clean up your code base, the urllib2 download code was really messy.

More info about Requests: http://docs.python-requests.org

[schlamar]

You should not merge this until this issue is solved: https://github.com/kennethreitz/requests/issues/655

[foamdino]

Upvote for using requests - a sane solution to connecting to webservices.

[schlamar]

@foamdino This is no good idea as long as requests does not support SSL via proxies (see the link above).

[wbond]

I am aware that the urllib2 code is really messy (and has gotten moreso recently due to needing to monkeypatch some core python stuff), but I believe it is finally at a point where it properly:

1. Works with proxy auth for HTTPS urls
2. Supports NTLM auth for HTTP and HTTPS proxies
3. Properly validates SSL certificates.

Any proposal to replace the urllib2 stuff will need to handle those. Feel free to re-open this if it does all of those.