Modify gitignore

Add *.class to .gitignore file
PandoraSong Class

Created PandoraSong class so we don't have to keep throwing around
JsonObjects.
PandoraGUI Class

No GUI yet, but functionality was changed to allow more modular control
via an external class.
PandoraSong Implementation in PandoraPlayer

Converted from JsonObject to PandoraPlayer class.
Several Functionality Changes

Added HTTP support, made login more modular, added PandoraSong class
support and removed previous JsonObject implementation, added
getStationList method, removed methods calling each other (Making this
more modular, and more like an API)