fix send_mail encode
fix send_mail encode

error undefined method `encoded' for #<String>
because mail-2.5.4 pass encoded message

yui-knk/jpmobile,matsu911/jpmobile,matsu911/jpmobile,yui-knk/jpmobile,xibbar/jpmobile,asonas/jpmobile,sunny4381/jpmobile,asonas/jpmobile,jpmobile/jpmobile,jpmobile/jpmobile,xibbar/jpmobile,sunny4381/jpmobile