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Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	netsound-server/netsound-api/src/main/java/edu/upc/eetac/dsa/dsaqt1314g4/netsound/api/PlaylistResource.java
	netsound-server/netsound-api/src/main/java/edu/upc/eetac/dsa/dsaqt1314g4/netsound/api/SongResource.java