First pass at adding ZooKeeper integration code contributed by Aswin Raveendran.
Added zookeeper cloud start sequence diagram.
Merge branch 'master' into tomk-zk

Conflicts:
	docs/uml/Makefile
Add back .md file for plantuml.
Make requirement Java 1.6 instead of 1.7.
Started implementation with raw zookeeper.
More implementation for raw zookeeper.
More zookeeper changes.
Merge branch 'master' into tomk-zk
Default help for -jar.
Make help default -jar class to run.
More interaction with Zookeeper.  Workers now register themselves.
Still need to implement the flatfile generation.
Remove curator.
Added ZooKeeperFactory.
Now able to create a cloud.
doWait now works.
PUB-784: Resolve merge conflicts, WIP toward sparsity constraints.
Added  optional link parameter to glm.
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
glm cross validation update.