Added ability to load multiple requireJS configurations from files and override with inline Gruntfile requireConfig, i.e.:

  templateOptions: {
    requireConfigFile: ['src/mainConfig.js', 'test/testConfigThatOverrides.js'],
    requireConfig: {
      param: 'this will override any param set in config files specified above'
    }
  }
Added RequireJS 2.1.6
Updated README.md to reflect support for multiple requireJS config files