Update Zend Framework to 2.2.x from 2.1.x
Create interface for classes that can be injected with a Doctrine entity manager

Implement the interface in a number of form classes that did not implement it before.
Stop using initializer in favor of configuration in the Doctrine resource

Soon, this work will be done by DoctrineORMModule when we switch from the ZF1
doctrine resource.
Rename the Doctrine service to fit with the DoctrineORMModule naming, and refactor session initialization

We aren't using DoctrineORMModule yet, but we are preparing to.