Enhancement get block list

- Add Valere Client object that wraps Deuce Client to provide the Valere functionality
  - Supports listing blocks from storage and metadata
- Add validation of the various portions of the manager
  - Adds rules and stoplight validations

DEPENDS: PR #5 
@TheSriram - Addresses your comment from PR #5 - https://github.com/rackerlabs/deuce-valere/pull/5#discussion_r20720113