Linux and Windows Support

Hey Joe,

i really appreciate your work on this sublime text package!
It's really awesome!

Please take a look at this patch for Linux and Windows support.

This is not production ready but works already pretty good.
For windows there are still some more issues than for linux.

I will continue working on this until everything works fine.

Notes:
Instead of MavensMate.app i use the app mode of google chrome.
Keychain support is now handled by a python package called 'keyring' (http://pypi.python.org/pypi/keyring) which apparently supports OSX, Linux and Windows.

Any feedback is welcome!

So long.
Matthias