Log Message:
Update ruby-net-ping package to 1.5.2.

== 1.5.2 - 4-Nov-2011
* The Net::Ping::HTTP class now defaults to using HEAD instead of GET
  for its ping test. You can alter this via the get_request accessor.
  Thanks got to Balazs Kutil for the patch.
* Added the ssl_verify_mode accessor to the Net::Ping::HTTP class, which
  defaults to VERIFY_NONE. This fixes possible warnings resulting from
  missing SSL certificates when using https. Thanks go to Balazs Kutil
  for the patch.