Added isStable method
improved auto-unload texture in CaptureRenderer : 
now unload only when running ut of memory (threshold 10mb).
added a new beautifull icon
Setting the method isStable()
added white square "contour" in captureRenderer
improved texture loading and unloading (delayed bitmap recycling)
CaptureRenderer : 
- Corrected regressuion bug snapshot3d not correctly unloaded
- set dots and contours not visible over 60 deg to improve (a lot!!!)
performances
- contours in correct orientation
in capturerenderer, modified way to compute distance.
Dots are now removed when the picture has been taken.
In insideRenderer : 
Added roll support.
Changed rotation matrix computation method.
roll now effective in CaptureRenderer
few useless refactor.
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/SettingStable'

Conflicts:
	src/fr/ensicaen/panandroid/sensor/SensorFusionManager.java
Camera autoshoot now regards roll before shooting.
Shooting near poles works!
Better texture unloading near poles.
fixed marks at 180 yaw was not disspearing on shoot