[gh-414] Add entityreference module to project

sites/all/modules/entityreference/LICENSE.txt

sites/all/modules/entityreference/README.txt

...odules/entityreference/entityreference.devel_generate.inc

sites/all/modules/entityreference/entityreference.feeds.inc

sites/all/modules/entityreference/entityreference.info

sites/all/modules/entityreference/entityreference.install

...s/all/modules/entityreference/entityreference.migrate.inc

sites/all/modules/entityreference/entityreference.module

...ce_behavior_example/entityreference_behavior_example.info

..._behavior_example/entityreference_behavior_example.module

...ns/behavior/EntityReferenceFieldBehaviorExample.class.php

...behavior/EntityReferenceInstanceBehaviorExample.class.php

...behavior_example/plugins/behavior/test_field_behavior.inc

...avior_example/plugins/behavior/test_instance_behavior.inc

...avior/EntityReferenceBehavior_ViewsFilterSelect.class.php

...all/modules/entityreference/plugins/behavior/abstract.inc

...es/entityreference/plugins/behavior/views-select-list.inc

...ection/EntityReference_SelectionHandler_Generic.class.php

...election/EntityReference_SelectionHandler_Views.class.php

...ll/modules/entityreference/plugins/selection/abstract.inc