Make timezonecomplete fit for in-browser usage

I added some build steps to bundle this fine library to be used directly in the browser. In the README.md there is an example how to use it.

I also initiated a bower package, so if you are convinced you can publish the bundle to Bower as well :). Just type `bower register https://github.com/SpiritIT/timezonecomplete`. There is already a tag `v1.3.1`, just tag any new version with a semver (ideally the same as the npm package) to update the bower registry.