Added birthday congratulations
Merge branch 'develop' into feature/rollcall

Conflicts:
	app/src/main/java/es/ugr/swad/swadroid/SWADMain.java
	app/src/main/res/values-ca/strings.xml
	app/src/main/res/values-es/strings.xml
	app/src/main/res/values/strings.xml
Updated Android Support library to 21.0.2
Added persistence of Rollcall data in database