Update examples for CDH 5.2.0

Updates pom.xml and the UseHCat.java for use with CDH 5.2.0+

Also enhances pom.xml and README.md a bit more to conform better with the actual usage example documented at http://www.cloudera.com/content/cloudera/en/documentation/core/latest/topics/cdh_ig_table_access_mapreduce.html