Adding Things to Do Card to styleguide

Added the "Things to Do" Card to the styleguide that was hiding in the views. Pulled the properties from the view and put them in the YAML. Also documented the options available to this card in the styleguide. An extra property was added to make the text in the button editable from the default "Book now," needed for A/B tests in Waldorf. 

If additional testing is needed, plug it in as you would any of the cards and fill out your needed properties.