TDD approach

Writing the first spec test for the default cause and laying out the
module for another developer to fill in the gaps as a learning exercise.
Filling in the code
Add script to validate that params are documented.

Looks to see that all params are in the README.md and adds a rake task,
`rake validate_readme` to run the script.
Initial coding
Merge pull request #3 from ghoneycutt/get_to_release1

Get to v1.0.0