Handlebars v1.3.0

All tests pass.
* [Handlebars v1.3.0 docs](https://github.com/wycats/handlebars.js/blob/master/release-notes.md#v130---january-1st-2014)
* [Handlebars v1.3.0 tag](https://github.com/wycats/handlebars.js/commits/v1.3.0)