MacOS + Linux Implementation

[Gaffen]

Hi there,

Thanks for creating this project, I've been looking at integrating Ultralight with OpenFrameworks and it will help me get a head start!

Unfortunately my primary dev environment is a mac and I was thinking I might try to integrate the .dylib files from the mac version of Ultralight. Whilst I'm at it I was thinking it would be worth doing the same for Linux.

I'm still pretty new to C++, but I'm good at learning new things. I was wondering if there were any tips you might have, or preferences for how it should be set up if I were to send a pull request?

Let me know!