pom.xml: Add fields required by maven central
pom.xml: Add fields required by maven central

Change-Id: I57b4c45e9f327d8dc1428e59d60ea26f97e27820

TribeMedia/kurento-module-creator,shelsonjava/kurento-module-creator,Kurento/kurento-module-creator,TribeMedia/kurento-module-creator,Kurento/kurento-module-creator,shelsonjava/kurento-module-creator