Add descriptions for
  - access to input values
  - setting input name.
Style the code.
Add demo.randomInt(...).
Users may want to access the input elements.
Correct the specifcation page's title.
Add randomInt and format in the demo.
Submitting the form by calling submit method.
Calling submit method to submit a direct form.
Calling submit method to submit a direct form.
Submitting a form by firing a jQuery method.
Submittion title.
Listen to a form submit by binding to `submit` event to the form
container.