Add freex command script, which shows actual free mem on Android devices,
including free mem available for applications. The free binary, made from
sources for linux, does not report free mem available for applications as
free mem, it only subtracts what is used by apps from total. And free mem
available for apps is reported as buffers/cache on Android, when it is free mem.

Thread by creator -=zeppelinrox=- at XDA:
FreeXplain-r / freex-BETTER than free & Why "free" RAM ISN'T WASTED!
http://goo.gl/9H58pS

The free binary will still be on devices for those that know how apps
free mem is reported on Android devices, but for newbies, or those who don't,
they can just use freex and see their true free mem... in color too!!!

Special Thanks to: -=zeppelinrox=- from XDA

Change-Id: Ica6e0dfa18f4b4419310fd429102290515c1053c
Add my ringtone an notification sound
Keep my name on my builds.

Conflicts:

	products/common.mk

Change-Id: I63562018836f8e57efc49ff11951a2a71c60b1c0