Stub for restore password question
Merge remote-tracking branch 'origin/master'

Conflicts:
	res/values/strings.xml
	src/it/feio/android/omninotes/utils/Constants.java
Fixed notes without images showing an image instead! (Maybe something
related to holder pattern usage)
Fixed misbehavior on showing location icon also if no location was set
due to check previously based only on "null" and not "0"
Security question&answer system to reset forgotten password
Improved thumbnails quality by sampling the image to the best quality
fitting the thumbnail dimensions and then cropping it on the center