* 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

For some tasks, I need to drop the username/api_key into configuration
files. Rather than rely on how I'm calling the rax modules. It seemed
more appropriate to authenticate against Rackspace and return the wealth
of information contained in the pyrax identity payload with other
modules/templates.