Merge pull request #11 from EasonLiao/master

Switch to new Jzab and add comand parsing.
Add more details to the spec
Merge pull request #14 from m1ch1/master

Add more details to the spec
Merge pull request #13 from EasonLiao/master

Clean up the code.
Merge pull request #15 from EasonLiao/master

Client can retrieve cluster information
Implement DataTree and DataNode.

Without ephemeral nodes support.
Implement Create/Mofify/Sequential node.
Add LICENSE header to source files.
Merge pull request #20 from EasonLiao/dev

Create/delete/modify tree nodes
Put metadata in headers of HTTP
Merge pull request #21 from EasonLiao/dev

Put metadata in headers of HTTP