Add encrypted data bag secrets to ChefDataUploader for SSHBase drivers.

References #77
Release 1.0.0.alpha.6, community awesomeness abounds.
Up version for development.
Expand documentation around run-time switches.

Document the --log-level and --destroy switches in the README.
Merge pull request #105 from grahamc/patch-1

Expand documentation around run-time switches.
Expose provisioner in driver configuration.

Exposes a new config file option: provisioner.

Detects if it is being init'ed in a Module or a Cookbook and defaults to
the right provisioner.

Passed to the driver as the `provisioner` configuration
item.

Includes updates to docs and tests.