README updates

* Wrap to 80 columns
* improved markdown conformance and plaintext readability
* note about setting PYTHONPATH inside squeaky clean virtualenvs
* note about using WikiWords as your cloudformation stack names
* note about how sometimes ansible says 'ok' when cloudformation says
  something broke
Make AWS region selectable on CLI

* Make it convenient (albeit, mandatory) to set AWS region on the
  command line when calling ansible-playbook for cloudformation
Rename *.yaml -> \1.yml

* It can be either way (ansible doesn't care) but it should be only one
  way, and the preponderance of existing configuration used .yml.
* Update to README to reflect changed filenames.
README update ascii art
Merge pull request #4 from jrbl/jrbl/feature/doc_update

Jrbl/feature/doc update