fix(package): update debug to version 3.0.0 (#7)

fix: update package.json to include main js file instead of tests and…

… other junk

fix: have each node watch sibling to avoid herd effect

feat(disconnect): now takes a callback to let you know after disconne…

…ct finishes

BREAKING CHANGE: callback is required in disconnect method

feat(zookeeper): add ability to use passed in zookeeper client

feat: simple leader election using zookeeper