Add simple RBE node

function/rbe/README.md

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+node-red-node-rbe
+=================
+
+A <a href="http://nodered.org" target="_new">Node-RED</a> node that provides provides report-by-exception (RBE) and deadband capability.
+
+Install
+-------
+
+Run the following command in the root directory of your Node-RED install
+
+    npm install node-red-node-rbe
+
+
+Usage
+-----
+
+A simple node to provide report by exception (RBE) and deadband function - only passes on data if it has changed.
+
+###RBE mode
+
+Outputs the **msg**  if the **msg.payload** is different to the previous one. Works on numbers and strings. Useful for filtering out repeated messages of the same value. Saves bandwidth, etc...
+
+###Deadband mode
+
+In deadband mode the incoming payload should contain a parseable *number* and is
+    output only if greater than + or - the *band gap* away from the previous output.
+
+Will accept numbers, or strings like  "18.4 C"  or "$500"