Add Ant build script.

Also, add support for generating local Doctrine proxy class files.
Update Composer deps.
Fix completed migration detection.
Add password hash column for users.
Add Omeka-specific auth components.
Add simple login implementation.
Fix authn code to use builtin Zend helpers
Merge branch 'develop' into userpage

Conflicts:
	module/Omeka/src/Omeka/Model/Entity/User.php
build the schema properly, without resorting to altering