Switch fireball to cm-10.2

The cm-10.2 branch now has fewer known issues than cm-10.1 on fireball -- most notably camera and camcorder are working.  The most outstanding issue that affects both cm-10.1 and cm-10.2 is some devices have flickering displays after display-on when device has been asleep for a while.  Otherwise, the remaining issues (volume and audio routing for camcorder) are manageable and being worked on.