Does not create cron events for unknown schedules

Tests schedules to se if they are known before creating cron events.
Without the test cron events were being created for schedules inserted
by third-party plugins
removed .gitignore
Merge remote-tracking branch 'upstream/master' into pr-deprecate-meta-chckout-details
Merge remote-tracking branch 'upstream/master' into only-known-cron-events-fix

Conflicts:
	wpsc-core/wpsc-functions.php
Colorbox CSS - Remove IE6 hack.

Remove support for IE6 transparency hack. We don't include the required images anyway (so wasn't working). Plus: http://www.ie6countdown.com/

Signed-off-by: Andrew <dent.ace@gmail.com>
switch to global ajax url utility function from old variable
Merge pull request #1013 from ace-dent/feature-css_tidy2

Colorbox CSS - Remove IE6 hack.
Revert "Colorbox CSS - Remove IE6 hack."

This reverts commit 270090af474fd734634b94a8bd4bc8e0ff9f008b.
First pass at extending capabilities in our importer.
Add product and product ID to wpsc_product_image filter.
Add product and product ID parameters to thumbnail filter as well.
more data map implementation
Remove some debuggery and fix importer.  We now have a nicely extendable importer.  That's cool.
more data maps
currency class object
Merge remote-tracking branch 'upstream/master' into cart_class_cart_api_cleanup

Conflicts:
	wpsc-includes/cart.class.php
Merge remote-tracking branch 'upstream/master' into dev-master
Merge pull request #485 from JeffPyeBrook/only-known-cron-events-fix

Do not create cron events for unknown schedules
Merge pull request #998 from JeffPyeBrook/cart_class_cart_api_cleanup

Updates to protect cart template API and WPEC from improper usage
Merge pull request #985 from JeffPyeBrook/eliminate-dynamic-js

Eliminate the dynamic creation and queuing of dynamic js script