A gateway implementation for ext-pq.

http://mdref.m6w6.name/pq-gateway

• 2015-05-20: 2.1.0 tagged
• 2014-10-15: 2.0.0 tagged
• 2013-05-15: 1.1.0 tagged
• 2013-05-03: 1.0.0 tagged

• Added pq\Query\AsyncExecutor::setCallbacks(callable $init, callable $done, callable $then)
  and removed soft dependency on reactphp/promise
• Fixed pq\Gateway\Table::with()'s relation handling when source table equals foreign table

• Published documentation
• Added support for pecl/pq-0.5
• Refactored relations

• Added support for one-dimensional arrays
• Added pq\Gateway\Table\Attributes (type support for input parameters)

• First stable release