[SPEC] Add ruby spec for some of the ripple bridge features
[FEATURE] Add ripple-lib to submit payments to ripple network.
[FEATURE] Add worker to robustly send payments
[FEATURE] Add resque for queuing payments
[FEATURE] Add ripple bridge invoice postgres table
[FEATURE] Add ripple invoices db model and coinbase invoices model
[FEATURE] Add controller and route to create coinbase invoices
[FEATURE] Configure coinbase payment callback handler to process ripple bridge payments
[FEATURE] Mark ripple bridge invoices as queued.
Merge branch 'ripple'