* Catch issues with invalid regions
* Ensure we send string only data as meta values in the rax module
* Add public_key/lookup example for rax_keypair
* Clean up import statements

- Remove deleted state
- Use dict() instead of raw hash
- Wrap or statements in parens instead of backslash line continuations
- Change instances to networks in module return result

Based on the refactor work @sivel is doing, adding a rax_network module
to create/delete networks in the Rackspace Public Cloud.

See: https://github.com/ansible/ansible/issues/4577