Major Refactor of PaypalTransactions and Vehicles
+ Need to tie transactions to policies rather than vehicles
+ Commit includes:
	- Changing routes file to map resource routes correctly
	- Removal of various helper functions that were in vehicles
	- Added covered? method to vehicles to determine based on
	  expr_date if a vehicle is covered.
	- Fixed up views calling old methods
	- Moved Billing History to the Policy view
	- Added policy/pay and policy/notify paths for payment transactions