Re-wrote app, added support for multiple feeds.

* Entire app re-written to use actual objects. Now is (hopefully) easier to extend and add on to. As well, separated out some of the various parts of the app (feed handling, account data handling, message sending).
* Now supports watching multiple feeds.
    * Will send separate emails/SMS/messages for each different feed.
    * BUG - It's very easy to accidentally enter the same feed twice, and it currently doesn't check if it's being already watching a feed. This means you can accidentally end up spamming yourself.
Ensured MIT license in file. Some small reformats.
Merged branch multi-feed with master.
Small changes to README to reflect expanded features.