Merge pull request #964 from JeffPyeBrook/pr-js-tuning

WP-e-Commerce javascript updates
Mildly better handling of displaying shipping modules via AJAX.
Merge pull request #965 from JeffPyeBrook/pr-get-all-customer-meta-fix

Get customer meta AJAX should not return error on empty keta keys
Fix pagination issue, fixes #658
Merge branch 'master' of github.com:wp-e-commerce/WP-e-Commerce
Fix improper dynamic_js reference.  Given that these have been 404ing for some time, I doubt we actually need them, but fixing, pending further investigation.
Parity with changes to shipping module UI.
Merge remote-tracking branch 'upstream/master' into pr-typo-in-function-name