Fixed variable error in wpsc-shipping/usps_20.php

The variable being tested is NOT the one being assigned the new instance of ASHTools().
Filter gateway checkout form output
Add docblocks for all functions in gateways.php
Split out ShareThis JavaScript.
Proper bracing on WPSC_Country
CSV download fixes
Fix for variation stock defaulting to 0 and documentation.
We've passed 2.3 million downloads

Pretty cool :)  We should reflect that
Merge pull request #246 from leewillis77/issue_241

CSV download fixes
Make "(Duplicate)" translatable.
Remove unused code block

This code is actually never going to be called.  It's tied to code that will never be called.  See #143.
Removing whitespace and closing tags in meta.functions.php

props @pippinsplugins
Fix hard-coded reference to 'products-page'.  Resolves issue #86.
Added wpsc_product_variation_price_available_from() function.

Gets a product's lowest variation price including variations that are out of stock.
Use wpsc_product_variation_price_from() instead of wpsc_product_variation_price_available().
Documentation and code formatting for functions that use wpsc_product_variation_price_from().
Deprecate wpsc_product_variation_price_available().
Fix instances of "siteurl" that should use home_url().
Remove unused  $siteurl references.
Use site_url() instead of get_option( 'siteurl' ).