Cleanup output of -P

• hide internal parameters i.e. those beginning with _
• present spec in a more helpful format than just pprint'ing the dict

mentioned in issue #5 (closed)

added bugusability label

removed bugusability label

added enhancementusability label

changed milestone to %0.2.x

marked this issue as related to #5 (closed)

marked the checklist item hide internal parameters i.e. those beginning with _ as completed