improvements in subscription to a GDS
first try to implement contextual menu
hci improvment, sorting logic for gruppidistudio implemented
new theme for actionmode, better date usage, dynamic text dimension
added
very small changes, push leaving lab
Merge remote-tracking branch 'origin/oauth22' into 2013-10-15_first

Conflicts:
	AndroidManifest.xml
	src/eu/trentorise/smartcampus/android/studyMate/gruppi_studio/Adapter_gds_to_list.java
	src/eu/trentorise/smartcampus/android/studyMate/gruppi_studio/Add_attivita_studio_activity.java
	src/eu/trentorise/smartcampus/android/studyMate/gruppi_studio/Display_GDS_research_results.java
	src/eu/trentorise/smartcampus/android/studyMate/gruppi_studio/RicercaGruppiGenerale_activity.java
	src/eu/trentorise/smartcampus/android/studyMate/gruppi_studio/ViewGruppiGrid_Fragment.java
	src/eu/trentorise/smartcampus/android/studyMate/gruppi_studio/ViewGruppiList_Fragment.java
fix merge