I'm afraid I'm not willing to accept contributions at this time, particularly because I've not yet decided on a formal licence yet. Some earlier versions were made available under public-domain and LGPL, and these can be found on my blog here, but they're fairly useless.
Active development is done under the develop branch, so if you want the latest cutting-edge version, that's where to look. Otherwise master is considered "stable", which at this early point in development doesn't really mean much, and you're probably better off going with the former branch for now.
Below are probably some of the most important documents to check out if you're looking to submit your own changes to the project.