Update to SWTBot 2.4.0

Reason: SWTBot 2.4.0 comes with several fixes (about menus) and other that JBT/JBDS can probably take advantage of
Project page/sources: http://eclipse.org/swtbot
Version: 2.4.0
License and owner: EPL, Eclipse.org
Original p2 repo: http://download.eclipse.org/technology/swtbot/releases/2.4.0
JBoss mirror: http://download.jboss.org/jbosstools/updates/requirements/swtbot/2.4.0/
Include Sources: No
Affected JBoss Tools components: tests
Include in JBDS: No
Type of dependency: testing
List of bundles added/removed:

If applicable:
non-p2 repository: ...
non-p2 ids: ...