Beeswax should load auxiliary libs specified via hive.aux.jars.path to classpath

One of the hive conf paramaters is hive.aux.jars.path, query submission modes such hive command line etc. - honor this parameter by loading jars specified via it to the classpath as a initialization step. This enables shipping of custom jars to hadoop job conveniently. A potential use case is custom UDF jars. In beeswax this improvement can be added by modifying the initialize method of BeeswaxServiceImpl class.