adding maven deploy code to build.xml .  jar can be pushed to maven central by running ant push_to_maven_central in pubnub/java/java/3.4/ dir   ~/.m2/settings.xml file need to be configured with proper values #5055016523978
deployment to maven central. need to run 'ant push_to_maven_central' with ~/.m2/settings.xml having correct credential settings i.e. sonatype credentials and gpg key  #4068685058049 #5055016523978
adding PubnubUtilCore doc file