New function to create shard space.

Example usage: (create-shard-space c {:name "test" :regex "/.*/" :retentionPolicy "1d" :shardDuration "1h" :replicationFactor 1 :split 1})
Add example usage inside examples/users.clj
Replace camel-cased keywords to dasherized ones
Merge pull request #13 from rborer/create-shard-space

New function to create shard space.