Various additions

Hi Perry,

I've added a number of items that I think are helpful and could be expanded upon.  I might have a fix for the build issue as well.  Please look over my submission, the major highlights are in this screencast:

http://screencast.com/t/5V45qLqpT3

Added menu
Common shortcuts on menu and contextual menu.
Added "New Project" functionality
Added a downloader for frameworks and classes
Added specialized snippets for physics joints, as well as scene, module, and class snippets.
New build process for windows 64 issue.

Now I've only developed this on Sublime 3, so have not tested on 2 yet.  I'm also new to python as well as this being a first time for me contributing to code, so go easy on me.

I would love any feedback or knowledge you can spare.

Cheers.