TSquare API stub out for development

I started on a TSquare API on my branch and I'm ready to merge this framework to master so that anybody else can work on it. Right now, it only does three main things: it authenticates with TSquare, gets some information about the logged in user, and gets the user's sites. I documented my code but I'll add some more documentation to the wiki as I write it. I haven't found any issues yet with my tests.

This API requires the 'requests' HTTP library (http://docs.python-requests.org/en/latest/user/install/#install). On Linux (and probably Mac OSX too), you can run
```sudo pip install requests```
and it'll do all the work for you. On Windows, clone the repo (git://github.com/kennethreitz/requests.git) somewhere and run
```python setup.py install```
in an Administrator cmd.exe.

I'd appreciate you guys's comments and suggestions on the initial code! :D

Thanks,
Sean