Revert "Revert "Switch to GEONODE_APPS method for running tests""

This reverts commit 99128be5b97a4944e9bc10a1d9ed3c07f27815e9.
Revert "Uncomment activity.send (causes failing tests that @garnertb will look at)"

This reverts commit de7d90267a9dc6c330199456bfc019d7a706d1dd.