fixes for billing errors on several lines: DEPRECATION WARNING: class_inheritable_attribute is deprecated, please use class_attribute method instead. Notice their behavior are slightly different, so refer to class_attribute documentation first. (called from included at ../lib/active_merchant/common/posts_data.rb:8)

http://stackoverflow.com/questions/7625611/deprecation-warning-class-inh
eritable-attribute-is-deprecated-when-execut
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