DevTools: Mock SMS (4/4)

(only when we merge TaPP)

This change brings the possibility of simulate the reception of SMS on real devices.
This change includes an activity to simulate the sending of a SMS throught the
mock SMS feature

Ported from http://review.cyanogenmod.org/#/c/23034/

Change-Id: Iae74cf23440fd0b1cd3b071d9875ad239a2902d7
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>