updated Firmata library to version 2.3.5 and moved to the new library format

libraries/Firmata/examples/EchoString/EchoString.ino

@@ -0,0 +1,44 @@
+/*
+ * Firmata is a generic protocol for communicating with microcontrollers
+ * from software on a host computer. It is intended to work with
+ * any host computer software package.
+ *
+ * To download a host software package, please clink on the following link
+ * to open the download page in your default browser.
+ *
+ * http://firmata.org/wiki/Download
+ */
+
+/* This sketch accepts strings and raw sysex messages and echos them back.
+ *
+ * This example code is in the public domain.
+ */
+#include <Firmata.h>
+
+void stringCallback(char *myString)
+{
+    Firmata.sendString(myString);
+}
+
+
+void sysexCallback(byte command, byte argc, byte*argv)
+{
+    Firmata.sendSysex(command, argc, argv);
+}
+
+void setup()
+{
+    Firmata.setFirmwareVersion(0, 1);
+    Firmata.attach(STRING_DATA, stringCallback);
+    Firmata.attach(START_SYSEX, sysexCallback);
+    Firmata.begin(57600);
+}
+
+void loop()
+{
+    while(Firmata.available()) {
+        Firmata.processInput();
+    }
+}
+
+