mozilla-b2g/gaia — pull request #1535 by timdream (2012-05-31 09:22:18+00:00)
Title: Clean up System app and deliver some of the Lock Screen v1 appearence

This pull request will disable hold down gesture of the volume key as workaround of #1514.

Sound Manager and Screen Manager now lives in their own files.

Screen Manager now listens to the hardware key itself, and handle SleepMenu for that (XXX)

Sound Manager and Screen Manager will emit custom `volumechange` and `screenchange` events. Lock screen is now triggered by `screenchange` events; it will not handle the hardware key directly anymore.