Gaia on Fennec

These are some changes I made to get Gaia working in Fennec on Android. They can be run with something like:

DESKTOP=1 make
adb shell rm -R /sdcard/profile
adb shell rm -R /sdcard/webapps
adb push profile/ /sdcard/profile
adb push profile/webapps /sdcard/webapps
adb shell am force-stop org.mozilla.fennec_USERNAME/.App
adb shell am start -a android.activity.MAIN -n org.mozilla.fennec_USERNAME/.App --es args "--profile /mnt/sdcard/profile" -d app://system.gaiamobile.org/index.html