change routings in payment flow
free_transactions still needs to point to listing_conversations views
added new-function to braintree transactions flow
removed unused new_conversation function
start different payment processes
renamed free transactions to 'free and checkout transactions'
from payment service separation to payment process separation
separated free transactions from post-pay transactions
refactoring: more explicit post pay status
Merge pull request #629 from sharetribe/separate-payment-processes

Separate payment processes
Fix implicit conversion to string error
Move transaction creation logic to service
Add TODO note
Merge pull request #645 from sharetribe/transaction-creation

Move transaction creation to service
Add HashUtils.sub
Merge pull request #646 from sharetribe/hashutils-sub

Add HashUtils.sub
Fix 404 pages