1.8.0
    Currency plugin support

1.7.1
    Bug fix in enumerator_iterator
    Make log level adjustable

1.7.0
    Update to killbill-api 0.7.1 and killbill-plugin-api 0.5.0 (pagination)

1.6.0
    New entitlement APIs + merge with search APIs

1.5.0 (don't use)
    New entitlement APIs

1.4.0
    Add search APIs
