Added trivial utility method hasPrefix to JPath.
Added trivial utility method hasPrefix to JPath.

quasar-analytics/quasar,slamdata/quasar,quasar-analytics/quasar,slamdata/slamengine,jedesah/Quasar,djspiewak/quasar,drostron/quasar,jedesah/Quasar,drostron/quasar,drostron/quasar,quasar-analytics/quasar,drostron/quasar,jedesah/Quasar,slamdata/slamengine,slamdata/slamengine,quasar-analytics/quasar,jedesah/Quasar