lispy.el (lispy--select-candidate): prettify

* lispy.el (lispy--select-candidate): Now says "semantic tags" in buffer
  "*lispy-goto*".
lispy.el (lispy-occur): prettify

* lispy.el (lispy-occur): Now says "this defun" in buffer
  "*lispy-occur*".
lispy.el (lispy--occur-action): improve
lispy.el (lispy-occur): deactivate-mark