Initial full library. Separated from win-IESoR into its own simulation library for easier access.

Technically, I should release the orginal C++ code as it's own module, then have that as a dependency to node-iesor. This is the simplest method for right now.

All libraries have valid cmake and gyp build files, so up to the person for how to compile JSON/Box2D/IESoR.

Next step? More solid testing. Going to validate through evolution because no validation files currently exist (old IESoR was in javascript).