Rename address book to course list.
Update next step
Read parameter from url
Demonstrate how to capture data from URL, and use a helper to output data.
Update readme
Change to reference data helper
add separate hello url element, and user and courseData hash, courses.slim will loop over hash
Add css to formatting
add logging
Add example of json
detect json type from url and return as appropriate.  error for unknown types.
update readme, remove unneeded comment for json return
return class list as json array.
update some TTD
add log directory and start yaml
update README, add .gitignore
update README, add .gitignore
read yml configuration and have /setting url to dump to log.
prevent stack trace with missing format
cleanup