Eliminate the dynamic creation and queuing of dynamic js script

* Implemented logic to automatically create globals in javascript based on properties sent to javascript using wp_localize_script
* New private function that sets up the wordpress localization array
* New public hook that lets plugin authors, themers and WPEC devs add new global javascript variables by adding to the localization array
* Deprecated unused localized javascript variables
* Added utility functions to easily get ajax url
* Eliminated shipping re-calculation on every page view
* Eliminated superfluous update shipping quotes AJAX call on shopping cart page
* Eliminated superfluous get cart data AJAX call on shopping cart page
* Eliminated superfluous get customer meta calls on shopping cart page initialization
* Consolidated two ready blocks in javascript