Updating Handlebars.js to version 1.0.0

Running `npm install` on a fresh clone now fetches the latest Handlebars (1.0.0), but the `lib` folder still contained RC1. This caused UI-rendering to fail after building (something has changed in the templates). This commit updates Handlebars to 1.0.0 in the `lib` folder and provides a working build with the new version.