Checkout Columns

Chu has proposed a solution, where we can just use two columns and put
the shipping and billing in column 1 and the rest of the fieldsets in
column 2. This would get rid of the whitespace.
Merge branch 'master' of https://github.com/numinix/fec

Conflicts:

catalog/includes/templates/YOUR_TEMPLATE/templates/tpl_checkout_stacked.
php