Context add/edit multi-step wizard form not auto caching

ctools_context_ajax_item_add() and ctools_context_ajax_item_edit() aren't specifying the correct auto caching settings which meant that the $form_state['conf'] variable wasn't being cached between steps when using a multi-step context form. The setting incorrectly include 'auto caching' instead of 'auto cache', and 'cache storage' instead of 'cache location'. I will provide a patch with a fix.