added textEncoding option for email

services/web/app/coffee/Features/Email/EmailSender.coffee

@@ -52,6 +52,8 @@ module.exports =
 			text: options.text
 			replyTo: options.replyTo || Settings.email.replyToAddress
 			socketTimeout: 30 * 1000
+		if settings.email.textEncoding?
+			opts.textEncoding = textEncoding
 		client.sendMail options, (err, res)->
 			if err?
 				logger.err err:err, "error sending message"