Reorganizes solution folder structure.

Closes #3 

- Renames existing project to .Core
- Adds .Data project to abstract database handling
- Adds .Tests project, which will contain unit tests
- Adds .Driver project which will compile to exe

NOTE:
- Add/Move App.config to Driver project

TODO:
- [Rob] Remove reference to ChatSharp in Driver. It's there right now so the solution compiles.