Changes

Summary

1. [sto12-tsk43] Adds unfollow event to service layer (details)

Commit a8f53e5f5a1fbb6d0536555148535e9c28787e81 by ifcunharro [sto12-tsk43] Adds unfollow event to service layer
	service/src/test/java/es/uvigo/esei/dgss/teama/letta/ejb/UserEJBTest.java
	tests/src/main/resources/datasets/user-unfollow-event.xml
	tests/src/main/resources/datasets/users-events-attendees.xml
	tests/src/main/java/es/uvigo/esei/dgss/teama/letta/entities/EventDataset.java
	tests/src/main/resources/datasets/users.xml
	service/src/main/java/es/uvigo/esei/dgss/teama/letta/ejb/UserEJB.java