Remove parallel_tests and zeus-paralell_tests gems
Run Bundle Update
Remove commented 'require 'rspec/autorun'' from spec_helper
Change Guardfile so that guard will randomize the seed each time
WIP - Refactor the Transaction's model to reduce coupling and clean up tests
WIP - Major refactoring of Transactions

Remove the "process user transaction" and "save user transaction"
actions.

Accept comments for transactions through :accepts_nested_attributes
instead of through a custom action.

Refactor the process_payment_recipient and process_purchase_category
actions so they have a public interface but keep the couplings in
private methods to reduce coupling in the public interface.

Add a is_subscription? helper.