Style updates for form elements.

Adds some more better default styles for form inputs and textareas.
Refs #239.

Also adds global box-sizing rule for more sane element sizing. See
http://paulirish.com/2012/box-sizing-border-box-ftw/ for more info.
Spruces up markup on new prism page.

Updates indentation for better code readability. Corrects some markup, and
removes some unnecessary markup.

Refs #239.
Simplifies CC License form section.
Specify smaller number of ros for description textarea.
Fixes #239.

Updates styles for new prism form.