Added `HotelScraper` class
Slowly moving to slightly revised scraper format

- Doubletree website is failing when I try to open page; have they caught on?
    - It could also be changes to their website; looks like it isn't allowing looking any further than a few months in advance?
        - I mean, if I vist the URL myself: https://secure3.hilton.com/en_US/dt/reservation/book.htm?execution=e1s1
Fixed Doubletree problem

- Caused by excessive derping
Fixed further bugs

- Now would be a good time to write tests
Transferred hotels to new format
Moved group codes to tracker.py
Removed cruft
Merge pull request #14 from nt3rp/improved-hotel-class

Improved Hotel Class