Update node-red-nodes - clean up lint issues (mainly unused funcs and vars)

hardware/Pibrella/38-rpi-pibrella.js

@@ -17,7 +17,6 @@
 module.exports = function(RED) {
     "use strict";
     var util = require("util");
-    var exec = require('child_process').exec;
     var spawn = require('child_process').spawn;
     var fs =  require('fs');
 

hardware/Pibrella/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-pibrella",
-    "version"       : "0.0.6",
+    "version"       : "0.0.7",
     "description"   : "A Node-RED node to read from and write to a Pibrella Raspberry Pi add-on board",
     "dependencies"  : {
     },