Tomcat flavor

Restful service under Tomcat.

1) Created a new module (rest-tomcat) to store a "listener class", web.xml and config resources(log4j,server.properties);

2) Turned public some private methods in org.dbpedia.spotlight.web.rest.Server.java (setDisambiguators, setSpotters) and create a new one as public to set Spotlight Configuration ( setConfiguration(SpotlightConfiguration configuration));