Added coredata and some forgotten UI change.
[issue #2] Core data setup & data init code.
[issue #2] randomly chooses one of all Washington's rules

Includes script for setting up initial DB with the full 110
Washingtonian rules.

Randomly chooses one at startup and sets rule text to that rule.

As yet no data model for remembering last viewed rule.
As yet no logic for changing rule at midnight.
[issue #2] currentRule as appDelegate property

This is better than before. currentRule is a property of the app
delegate now and app delegate has a private convenience function for
grabbing a random rule string from the data.
[issue #2] stubbed out settings

Not yet implemented.
Data model is there and stub function with no actual functionality.
[issue #2] Changed entity names.

Involved rerunning data initialization (what a pain that is,
    had to give myself another copy of persistentStoreCoordinator to
    switch to when re-init'ing. Need to make that better.
[issue #2] New rule every day on launch.

Now has app settings which are being used to store last viewed rule and
last day that rule was viewed on.

Rule view updates on launch. App's current rule updates on return from
inactive if day is different, but the view is not updating based on this
change yet (without a relaunch of the app).
[issue #2] updates rule when returning to active
Merge pull request #14 from factorial/issue-2

Issue 2 - change rule every day