Maven build environmental for pipl java api

I have added maven support for pipl api. I have changed the source code folder structure only for maven, not changed anything in your java code. 

I have deployed the jar into maven central repo also. Now its in staging repo https://oss.sonatype.org/content/repositories/central_bundles-1927/ . Soon it will be synced with maven central repo. So anyone can access pipl api via maven dependency.