Describe how to use the html_content option.

Used callout_editorial to drive out functionality but may need to
swap with a helper than actually uses that option.
Refactor Dough::Helpers#method_missing so is more flexible
Update specs with current helper examples
Improve the readability of Dough::Helpers
Don't constrain the local variables we pass our helper renders
Clean up the way helper partials are rendered
Describe the callout_editorial helper
Helpers / partials for buttons, callouts, field_help_text, slider, show_hide
Update CalloutInstructional
ShowHide - insert content
Use html_safe to render markup
Slider - pass in fuller set of attributes
FieldHelpText - restore hardcoded id's on elements
Add button types to style guide - directional and inline
Need to be able to run specs when rake is run
Getting errors when trying to load 'rails/tasks/engines.rake'. Remove
Describe what we expect a helpers content and heading to render like
Describe how the tab selector generates the tab hash for rendering
Appease the spacing gods
Add Show n Hide component