Add in the pugi xml parser as a third party library.

This library is to be used to verify that xml requests are properly
sent and can be parsed by the client / worker correctly.

Change-Id: If8ee3d5c71344d35d40ff23dc2fdb1af8c13796c
Adding in cjson as a thirdparty.

Change-Id: I9a22ae7d96322b64976f6f451180ccdb40ad6af5
Merge branch 'more_thirdparty'

Change-Id: Ief31f4b199495fea1dd0e8f9f79817cc2118da14