- Added `priviliged` option to task config to allow containers to run in
 priviliged mode.
- Added `dns-servers` option to task config to allow containers to use
  custom DNS servers
- Added `search-domains` option to task config to allow containers to
  use custom dns search domains
- Added authentication options (under key namespace `auth.*`) to allow
  authentication on a task level for docker remote.
- Updated site docs to reflect changes

…cker-driver-options

* 'master' of https://github.com/hashicorp/nomad: (59 commits)
  Move the executor and spawn package into driver
  Remove file watching
  Check if the PID is alive instead of heartbeating through modify time
  Update CHANGELOG.md
  nomad/watch: add a note about the Item struct
  go fmt this file
  Vet errors
  Search path
  Update website
  Make a basic executor that can be shared and fix some fingerprinting/tests
  Small improvements
  Use const value for AWS metadata URL
  Create Spawn pkg that handles IPC with the spawn-daemon and update exec_linux to use that
  Fixed the restart policy syntax
  Introducing vars to create default batch and service restart policies
  Fixed the tests
  Declaring Batch and Service default restart policies
  Fixing tests to not create a TG without restart policies
  This option only work -> This option only works
  leave -> leaving
  ...

- Added error checking on priviliged mode.
- Added `docker.privileged.enabled` to client config/fingerprint

returned wrong value, and forot a ":" :/