Make Discovery plugable, add a disabled and Rackspace provider.
Allow overriding what metadata key to search for.
Add deps.
Add support for common env variables used for Rackspace Region, Username, and API Key.
Backoff hitting the cloud servers APIs if nothing is changing.
Buffer large requests to disk, rather than putting it all in memory.
Just use requestLength
Add tests for the Body buffer.
Cleanup request bodies, unlink them as soon as possible, and make sure we call close.
Merge pull request #41 from pquerna/buffer_large_requests_to_disk

Buffer large requests to disk
Allow javascript to search by any metadata key.
Call it noop discovery.
Remove dead return.
Merge pull request #40 from pquerna/plugable_discovery

Pluggable Discovery backends
Remove trailing slash.