adding manager script

expose management commands to allow for shell one liners.

fix the remove node command such that it fixes the scheduler if the
command is removing a bucket from a node.

add a set_node_tags command to the configuration to reset the tags
without delete/add the node.
Merge pull request #3 from bauman/add-manager

(•_•) 
( •_•)>⌐■-■ 
 (⌐■_■)