Plugin support

- Homebridge is now designed to be `npm install`d globally and
executed via "homebridge" script
  - Remove all specific accessories/platforms except for an example
  - New internal structure and "cli"

lib/version.js

@@ -0,0 +1,12 @@
+var fs = require('fs');
+var path = require('path');
+
+'use strict';
+
+module.exports = getVersion();
+
+function getVersion() {
+  var packageJSONPath = path.join(__dirname, '../package.json');
+  var packageJSON = JSON.parse(fs.readFileSync(packageJSONPath));
+  return packageJSON.version;
+}