Transaction entity
Move "entity" to datatypes
Instructions to create premier or business account

Changed PayPal instruction copys to point out that either a premier
account (for individuals) or a business account (for companies) is
needed to accept payments.
EntityUtils to_symbol transformer, use with care
Add billing agreement created spec
Make receipt id optional
Add paypal refunds
Paypal refunding service and ipn handling
Limit string db fields
Add validations for paypal refund
Merge pull request #680 from sharetribe/eutils-tosym

EntityUtils to_symbol transformer, use with care
Merge pull request #673 from sharetribe/ipn-refund-order

Ipn refund order
WTI pull
Merge pull request #678 from sharetribe/transaction-entity

Transaction entity
Merge pull request #679 from sharetribe/paypal-account-type

Instructions to create premier or business account
Rebase to master
Merge branch 'logo-change-allowed' of https://github.com/sharetribe/sharetribe into logo-change-allowed