Introduce rollup #4
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Rollup (http://rollupjs.org/) is a module bundler that converts projects using the ES2015 module system to a single JavaScript file.
By using a typescript plugin, we can compile from ts to js in the same step. Correct sourcemaps are also generated. Additionally, a tree-shaking algorithm removes unused code from the output file.
Note that due to a bug (rollup/rollup-plugin-typescript#43), rollup does not currently output non-fatal errors from TypeScript. To see those, simply issue
npm run tscin your main directory. (That will invoke tsc directly with the noEmit option.)