android_sensor: changes to include sensors in android_app

Signed-off-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>
DIRTY : changes to android_sensors

Signed-off-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>

Conflicts:
	lib/mnit_android/android_app.nit
examples: mnit_ballz

Signed-off-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>
DIRTY: mnit_android_app modifs

Signed-off-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>
mnit_android: android app final

Signed-off-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>