WIP: isolate block cluster
Fix bug of GC connection configuration
Shorten module name
WIP: wighted random selection logic
WIP: Store free spaces and weights information to Riak
Add container ID to bucket record in moss.buckets
WIP: Add container ID to bucket record in user record in moss.users
WIP: Check-out another riakc in multi-cluster settings to manipulate manifests
WIP: Store/fetch manifests to/from the cluster in bucket record
Pass default riakc pid to block server

When one configures system with single block cluster and multiple
manifest containers (although it is not probable), block_server should
use default riakc.
Make Object ACL and MP upload multi-cluster-aware
Make list objects multi-cluster-aware
Add script to control allocation weights
Fix bug of weight initialization
Use proper riakc connection in storage calculation