Update templates

I updated the following in the templates folder:

- index.html, 404.html and htaccess to reflect the changes made to the H5BP [4.2.0](https://github.com/h5bp/html5-boilerplate/blob/master/CHANGELOG.md#420-april-8-2013)
- bootstrap.js to 2.3.1
- bower components
- npm devDependencies