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Firecracker v0.7.0 release

Added
* Rate limiting functionality allows specifying an initial one time
  burst size.
* Firecracker can now boot from an arbitrary boot partition by
  specifying its unique id in the driver's API call.
* Block device rescan is triggered via a PUT /actions with the
  drive ID in the action body's payload field and the action_type
  field set to BlockDeviceRescan.

Changed
* Removed `noapic` from the default guest kernel command line.
* The action_id parameter is no longer required for synchronous PUT
  requests to /actions.
* PUT requests are no longer allowed on /drives resources after the
  guest has booted.

Fixed
* Fixed guest instance kernel loader to accelerate vCPUs launch and
  consequently guest kernel boot.
* Fixed network emulation to improve IO performance.