Big ass usage string

I <3 good CLI documentation!
Handle CLI execution as methods
Normalise Task: Store tar balls in system tmp
Accept directory to normalize training data to
Implement get-examples command
Put command methods into a module

This makes it a little easier to distinguish between these methods and
some other methods that will end up in the CLI class
Comment for what KaratSleuth::CLI.start does
Only pass the command arguments to the CLI object
Handle parsing arguments for emails to apply to