Package-tree refactors.

I made some changes to the package tree:
* Top-level package is now ```edu.allegheny.knightingale```, not ```edu.allegheny.tweetanalyze```
* Renamed ```refresh``` package to ```twitter```, as I plan to move user-name fetching functionality to it at some point (IO localization)
* Put ```refresh```(now ```twitter```) and ```parser``` packages in ```io``` package (additional IO localization)

None of these are a big deal, and the system still builds and runs fine. Should be able to be auto merged successfully.