UPGRADE 3.1



git-svn-id: https://silverstripe-ecommerce.googlecode.com/svn/modules/ecommerce_tax/trunk@4757 950b781c-c544-efab-2f99-90083ee69683
UPGRADE 3.1 error fixes

git-svn-id: https://silverstripe-ecommerce.googlecode.com/svn/modules/ecommerce_tax/trunk@4758 950b781c-c544-efab-2f99-90083ee69683
config improvements

git-svn-id: https://silverstripe-ecommerce.googlecode.com/svn/modules/ecommerce_tax/trunk@4760 950b781c-c544-efab-2f99-90083ee69683