Enable overriding of default (emulator) resolution

Open-webOS-DCO-1.0-Signed-off-by: Steve Lemke <steve.lemke@lge.com>

Change-Id: I66039f6da833a519e9e2434921694e873b474bcc
Reviewed-on: http://g2g.palm.com/1618
Reviewed-by: Build Verification
Reviewed-by: Martin Jansa <martin.jansa@palm.com>
Reviewed-by: Steve Lemke <steve.lemke@lge.com>
Tested-by: Steve Lemke <steve.lemke@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>