Merge pull request #15 from JohnPostlethwait/error-body

Passing along potential form validation messages with 400 error request responses.
Bump version for release to NPM
Arbitrary version bump because NPM fails
Fix start/stop actions for Nova
Allow listing all in-use floating IPs

Uses the "bulk" floating IP extension to simulate
the ability for an admin to list all floating IPs
currently in use in the cloud.