re-created variations branch

git-svn-id: https://silverstripe-ecommerce.googlecode.com/svn/branches/burnbright_variations2@311 950b781c-c544-efab-2f99-90083ee69683
Complex variations (ie product attributes, values)
+ bulk loading

git-svn-id: https://silverstripe-ecommerce.googlecode.com/svn/branches/burnbright_variations2@405 950b781c-c544-efab-2f99-90083ee69683