Storage Settings: Allow user to trigger a volume rescan

This change allows to trigger a rescan of a volume with the next restrictions:
- Internal volumes if they are emulates
- Primary volumes
- Non-Removable volumes

Ported from: http://review.cyanogenmod.org/44586

Change-Id: I7e75a324938d8081fd715f702d50f1fdceabd96d

Conflicts:
	res/values/cm_strings.xml
Settings: Day and week on data usage cycle (2/2)

Adds the ability to set day and week on when the data usage graph resets, instead of just month.

Change-Id: I5974e1b7143d09ffd6fcd6db113c3f7511346bfa

Conflicts:
	res/values/cm_arrays.xml
	res/values/cm_strings.xml