Include Webmock gem
Corrected relationship between bill and legislator

Model had relationship wrong. A legislator can sponsor multiple bills
and a bill can only have one legislator sponsoring it.
Created webstubs

Initial writing of stubs
Added mock for SocketError

Added a mock stub for instance where there is a bad url
Cleaning up stub requests.

Cleaned up query of stub requests
Set webmock to not be required by default.

Set Webmock to require: false or else no http requests in application
can be made.
Removal of unneeded columns in bills.

Remove fields enacted_as and related_bill_ids
Updated db:seed to populate database.

Database is now seeded with the help of the updated CongressAPIReader.