Implementation of a single-file Readium.JS library in several variants

Hi!

This pull request contains implementation of a single-file Readium.JS library in 4 variants (asynchronous RequireJS loading vs synchronous loading from a SCRIPT tag using almond, minified vs non-minified).

Updated usage examples for both asynchronous and synchronous loading are in https://github.com/aadamowski/readium-viewer-demo1 on the `readium-sdk-renderer-integration-almond` branch.