Numerous fixes to address UMD (AMD) loading when bundled via downstre…

…am libraries.

 * Fixed UMD Loading issues.
 * Added ES and IIFE variants as well.
 * Updated to ES6 Modules.
   * Main Source and Tests.
 * Migrated to rollup for packaging.
   * Nuked Gulp.
 * Updated test coverage to C8.
 * Version bump to v2.0.3.