Centralize CLI registration
Use riak_cli:register/1
Merge pull request #658 from basho/update-handoff-intg

Centralize CLI registration
Fix to use the correct riak_cli branch

"master" doesn't exist anymore. It has been renamed to "develop".
First go at cluster status
Export partitions/2 to reuse elsewhere
Continue implementation of cluster commands
Fixes from manual testing
Remove erroneous shortname handlers
Use riak_cli behaviour; use riak_cli_status

Remove all usage of direct io:format in favor of the
riak_cli status types.  This will hopefully simplify
output.
Add cluster_cli to cli registry