update the panel class to bs3
update cartridge.css to BS3
update account_profile_update.html to BS3
update category.html to BS3
upgrade to BS3
upgrade to BS3
upgrade to BS3
upgrade to BS3
upgrade to BS3
upgrade to BS3
upgrade to BS3
upgrade to BS3
Better responsive design in shop category pages.
Use more Bootstrap classes to style the shop category page.
CSS cleanup and prettification.

The 'one rule per line' style is consistent with the rest of Mezzanine
and makes diffs easier, as well as making the styles more accesible
for newcomers.
Appearance and responsive enhancements in the product template.
Responsive and style tweaks for shopping cart template.

- Use more of bootstrap's classes instead of implementing our own.
- Correctly handle the discount form.
- Apply vertical-align: middle to the table.
- Use thead and tbody properly.
- Style cart errors in red.
- Use consistent markup for defining product thumbnails.
Responsive and style tweaks for billing, shipping, payment and
confirmation templates.
Replace {{ STATIC_URL }} with {% static %}.
Use Magnific popup as gallery viewer in the product page.