CLI setting for custom homebridge "home" path

Fixes #378

lib/cli.js

@@ -13,6 +13,7 @@ module.exports = function() {
   program
     .version(version)
     .option('-P, --plugin-path [path]', 'look for plugins installed at [path] as well as the default locations ([path] can also point to a single plugin)', function(p) { Plugin.addPluginPath(p); })
+    .option('-H, --homebridge-home [path]', 'look for homebridge user files at [path] instead of the default location (~/.homebridge)', function(p) { User.setStoragePath(p); })
     .option('-D, --debug', 'turn on debug level logging', function() { require('./logger').setDebugEnabled(true) })
     .parse(process.argv);