enabled navigation from actionbar;
added wizard to create new attivitàstudio;
added wizard to insert an attachment;
minor bugs fixed;
last commit on branch gruppi_studio
finalo commit
Merge remote-tracking branch 'origin/gruppi_studio' into aac

Conflicts:
	.classpath
	AndroidManifest.xml
	res/values/strings.xml
	src/com/example/model_classes/AttivitaStudio.java
	src/eu/trentorise/smartcampus/studyMate/models/Evento.java
	src/eu/trentorise/smartcampus/studyMate/models/Studente.java
	src/eu/trentorise/smartcampus/studyMate/utilities/AdapterFeedbackList.java
	src/eu/trentorise/smartcampus/studyMate/utilities/AdapterRating.java
	src/smartcampus/android/studyMate/finder/FeedbackFragment.java
	src/smartcampus/android/studyMate/finder/HomeCourseDescriptionFragment.java
	src/smartcampus/android/studyMate/gruppi_studio/RicercaGruppiGenerale_activity.java
	src/smartcampus/android/studyMate/start/MyUniActivity.java
fix