Removed deprecated Googleplus moments service


git-svn-id: http://google-api-php-client.googlecode.com/svn/trunk@538 6c5fc399-1a2c-022f-82ce-feb0d0b4916c
Updated AdExchange Buyer service class.


git-svn-id: http://google-api-php-client.googlecode.com/svn/trunk@539 6c5fc399-1a2c-022f-82ce-feb0d0b4916c