Rewrite to use the pure JS zookeeper client library

- [x] Fix tests 
- [x] travis 
- [x] the vm

> The purejs `node-zookeeper-client` does throw when some unexpected things happen so some `try`s are probably needed in here.

^ This is not plausible unfortunately. There are about 40 places where this can throw if zookeeper does something unexpected. Not sure how much of an issue this is.
Right. Errors are unique, if we get more than one error in a row I think it's worth re-emitting the error event. I wasn't sure if sometimes we might not see duplicate events from the client library so I added that condition.