Added documentation to the webdriver world.
Added Documentation task to generate json of the steps and their descriptions.
Documented Gruntfile documentation task.
Added docs run.
Add documentation to screenshot task.
Added usage example and internal function docs.
Documented Screenshot world implementation.
Doc'd last steps.
Refactored documentation task.
Added docs to a couple places.
Moved documentation task to its own file.
Merge pull request #1 from DavidSouther/documentation

Documentation