Abstract Feed Scraping Logic / Add Feed CRUD

 - Removed SqueakyBeaker class
 - Added logic to Feed class
 - Updated seeds.rb to add squeaky beaker feed
 - Removed Nokogiri class (wasn’t being used)
 - Added some basic routes/views/controllers for
   feeds.
Merge pull request #4 from pdornfel/abstract_feeds

Abstract Feed Scraping Logic / Add Feed CRUD