Added tests for the main controller separate route to fill out a captcha
Adding a separate route to fill out the captcha.  Using fill_form_helper and fiber to perform this.
Added a test to ensure the persistent hash ff deletes fibers after they are no longer needed
Making tests pass by deleting used fibers
Moving all the fiber wrangling into form_fill_handler
Returning relative URL for the captcha image
Adding to README.md