allow the external-scripts.json to be an object

specify scripts in a module to load:

{
  "module-name": [
    "scripts",
    "to",
    "load"
  ],
  "modulename-2": [
    "more",
    "scripts",
    "toload"
  ]
}

or the old array containing multiple module names loading all scripts in the
module:

[ "module-name", "modulename-2" ]

src/robot.coffee

@@ -215,12 +215,16 @@ class Robot
   # Returns nothing.
   loadExternalScripts: (packages) ->
     @logger.debug "Loading external-scripts from npm packages"
-    for pkg in packages
-      try
-        require(pkg) @
-      catch error
-        @logger.error "Error loading scripts from npm package - #{error}"
-        process.exit(1)
+    try
+      if packages instanceof Array
+        for pkg in packages
+          require(pkg)(@)
+      else
+        for pkg, scripts of packages
+          require(pkg)(@, scripts)
+    catch err
+      @logger.error "Error loading scripts from npm package - #{err.stack}"
+      process.exit(1)
 
   # Setup the Express server's defaults.
   #