Global methods

Dear Matt, 

I wrote some global methods (using both API 1 & 2) that can easily be added to bgg_api. Code works, stubbed and otherwise. I also added a Rubygem.spec but I haven't tried it yet (I have no experience). I also wrote some docs in Rdoc, since I don't know .md, and it's up to you as to how to integrate them. 

Let me know.