Add a delete-policy command

Adding a command to delete policies.
razor delete-policy --name <policy_name>

Database:
Added a 'bound' field to the nodes table.  This will be the authoritative indicator as to whether or not a node is bound.  Nodes can be bound without a policy (although they still need a policy to apply at some point to become bound)

Behaviour:
  - Deleting a policy will:
    > Disassociate any tags from the policy
    > Disassociate any nodes from the policy
    > Destroy the policy.

  - Booting a node:
    > If the node is bound and has a policy, the installer from the policy will dictate the boot action.
    > If the node is bound but has no policy (it has been deleted), the noop installer will be applied, forcing a local boot.
    > If the node is not bound (bound = false) boot the micro kernel and wait for a policy.

Views:
  - nodes:
    > Now shows the IP and hostname in the nodes list.

  - nodes <name>:
    > Shows the value of bound (True | False) if the policy is not set, shows a message for policy stating that the policy has been deleted of changed such that no longer matches (future).

Disclaimer: My ruby skills are about 2 weeks old (torqueBox/rack/sequel, about 2 days old).  All the above works in my testing, but someone with better ruby knowledge should sanity check it.  Specifically the file db/migrate/002_create_base_schema.rb, im not sure how to test this....

Thanks,
Chris