Schedule Roadmap/M2.5/AutoOrientation

Feature Requirements

• We already support this in gecko; it's pref'd off
• Make a change to allow Gaia apps that *don't* support multiple orientations to block orientation changes
• Make the rest of the Gaia core apps work well both in portrait and landscape
• Based on the orientation of the screen and using the accelerometer sensors, each app that support both landscape and portrait should respond accordingly