CKAN 2.1.1

Bug fixes: * Fix errors on preview on non-root locations (#960) * Fix place-holder images on non-root locations (#1309) * Don’t accept invalid URLs in resource proxy (#1106) * Make sure came_from url is local (#1039) * Fix logout redirect in non-root locations (#1025) * Wrong auth checks for sysadmins on package_create (#1184) * Don’t return private datasets on package_list (#1295) * Stop tracking failing when no lang/encoding headers (#1192) * Fix for paster db clean command getting frozen * Fix organization not set when editing a dataset (#1199) * Fix PDF previews (#1194) * Fix preview failing on private datastore resources (#1221)