call setEncoding on native stream

lib/devices/node._js

@@ -9,6 +9,9 @@ require('../reader').decorate(streams.ReadableStream.prototype);
 require('../writer').decorate(streams.WritableStream.prototype);
 
 function fixOptions(options) {
+	if (typeof options === "string") options = {
+		encoding: options,
+	};
 	options = options || {};
 	options.ez = true;
 	return options;
@@ -25,7 +28,10 @@ module.exports = {
 	///   For a full description of the options, see `ReadableStream` in
 	///   https://github.com/Sage/streamline-streams/blob/master/lib/streams.md 
 	reader: function(emitter, options) {
-		return new streams.ReadableStream(emitter, fixOptions(options));
+		options = fixOptions(options);
+		var reader = new streams.ReadableStream(emitter, options);
+		if (options.encoding) reader.setEncoding(options.encoding);
+		return reader;
 	},
 	/// * `writer = ez.devices.node.writer(stream, options)`  
 	///   wraps a node.js stream as an EZ writer.