New NetSuite record types: Credit Memo and Customer Deposit.

Updated type_scraper to fix bugs in the template, and to show a hint when not enough arguments have been entered.
Exposing new types
Fixed bad store accessor creation behaviour. When a NSConnector::Resource subtype has a field called 'class', this now uses the _class and _class= accessor methods.
Merge pull request #6 from rtrvrtg/new-types2

Added specs for new resource types and fixed store accessor methods