Edited wiki page ThirdPartyAddOns through web user interface.

git-svn-id: http://protobuf.googlecode.com/svn@553 630680e5-0e50-0410-840e-4b1c322b438d
put python cpp tests into pyext/


git-svn-id: http://protobuf.googlecode.com/svn@554 630680e5-0e50-0410-840e-4b1c322b438d
change to gtest head


git-svn-id: http://protobuf.googlecode.com/svn@555 630680e5-0e50-0410-840e-4b1c322b438d