Instead of using static buttons, use the CSS buttons.

Start to use more structured class names.
Remove the static sign in images.
CSS belongs in the CSS file.

If persona-only authentication is enabled, add the persona--persona-only-auth class to the body.
Use a helper function to print the option input fields.
Clean up CSS. Make sure reg/comment form handlers are only attached if enabled in plugin config.
Add form validation code to the submit and comment code to disable the Persona button until the forms are ready.
add a $ alias for jQuery.
Make sure the Persona button text always shows as white.
Fix the activation error.

fixes #27
Rename the main class MozillaPersona
Why oh why Wordpress, do you make CSS so tough?
Overriding Wordpress styles for the Persona button.
Remove the Persona button for commenting. It's behavior
was ugly.
Adding persona__error modifiers for the login and comment pages.
No longer use the login message filter, instead check for errors in init and set the global $error value.
Bring back the "waiting" whitescreen.
Add a spinner graphic to the waiting screen.
Merge branch 'css-button'