jclouds-163

FOR REVIEW ONLY

this points at the rc2 staging repository which will go away soon -- revert 8b9196c before merging, and of course wait for 1.6.3 to be available from maven central

however this PR can be merged locally and will work now, so you can review it immediately. i'd like review comments now so we can merge right away when 1.6.3 lands!