fix loaderConfig global leak
fix loaderConfig global leak

douglasduteil/builder,jrauschenbusch/builder,whitneyit/builder,douglasduteil/builder,alexisvincent/builder,jrauschenbusch/builder,alexisvincent/builder,lookfirst/builder,lookfirst/builder,jrauschenbusch/builder,systemjs/builder,systemjs/builder,systemjs/builder,whitneyit/builder,alexisvincent/builder