Async js bootstrap template

The bootstrap template to resolve dependencies of an js app before its invocation while that app along w/ dependencies are loaded asynchronously

This working concept implements the solution to avoid the niggling trouble of asynchronous loading in browser when an app itself are loaded & invoked faster than the whole bunch of its dependencies

The bootstrap is not limited to modern browsers & can be safely utilized w/ legacies (IE9 & above are in, IE8 & below require additional polyfill)