Implement the getName method in PhabricatorApplication subclasses
Summary: Provide an implementation for the getName method rather than automagically determining the application name.
Test Plan: Saw reasonable application names in the launcher.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D10027