Merge b2ginbound to central, a=merge CLOSED TREE

b2g/config/aries/sources.xml

b2g/config/dolphin/sources.xml

b2g/config/emulator-ics/sources.xml

b2g/config/emulator-jb/sources.xml

b2g/config/emulator-kk/sources.xml

b2g/config/emulator-l/sources.xml

b2g/config/emulator/sources.xml

b2g/config/flame-kk/sources.xml

b2g/config/gaia.json

b2g/config/nexus-4/sources.xml

b2g/config/nexus-5-l/sources.xml

dom/apps/Webapps.js

dom/apps/tests/mochitest.ini

dom/apps/tests/test_checkInstalled.html

dom/icc/tests/marionette/test_stk_send_dtmf.js

dom/icc/tests/marionette/test_stk_send_sms.js

dom/icc/tests/marionette/test_stk_send_ss.js

dom/icc/tests/marionette/test_stk_send_ussd.js

dom/mobilemessage/MobileMessageCallback.cpp

dom/mobilemessage/interfaces/nsIMobileMessageCallback.idl