Add support for sharded collections

[jsteemann]

I have added support for specifying numberOfShards and shardKeys when creating a collection. I have also implemented the Collection.Properties() method to retrieve collection properties from an existing collection. Additionally I have implemented the call to /_admin/version to retrieve the server's version and role (if in a cluster, I needed this to activate/deactivate some tests).

[Dashue]

Awesome, how come this has not been pulled in yet?

[yojimbo87]

I will have to partialy rewrite it since it was pushed to branch which had old code base and refactored branch already differed substiantially at that time.