Add bower support

used to register the package with bower:
`bower register auto-reload-brunch git://github.com/brunch/auto-reload-brunch.git`

now it's possible to:
`bower install auto-reload-brunch`
and have it automatically compiled by brunch, e.g. in config.coffee/files.javascripts.joinTo:
``` coffee
        'js/vendor-develop.js': /// # additional vendor lib for development
          ^vendor.*[\\/](
              'auto-reload'
            )\.js$
          ///
```