Many bug fixes and documentation


Candidates
* Only showing data about elections for the year requested
* Fix a bug in candidate party filtering
* Search for state the candidate is running in, not committee mailing address state
* Fix district filter
* Fix single resource 
* Update Documentation

Committees
* committee org_type filtering
* Better fake_party
* fix single resource 
* Update Documentation

 Plus tests

This fixes #120, #121, #122, #123

This addresses issues #112 and #117 but there may also be a front end component to that. To make sure we are consistent with showing and filtering committee type and org type.