pom.xml: Do not add dependencies tag if there are no dependencies

Change-Id: Ifd611bdb6ff01795da19cd63982589ef9d391c9d
pom.xml: Version range for maven plugin

Change-Id: I8c9b96138cda392eef1651aecdfaf1cdf73464cc
js: Remove kurento specifics from js templates

Change-Id: I9470b68ee2ccc6fc877a5476894bf31b1793d3e7