assemble/assemble — pull request #376 by doowb (2013-10-26 00:48:19+00:00)
Title: Making helpers work like plugins.

Adding a params object to the call to a helper.register so we can
pass in grunt and assemble and they can be used from inside helpers.

New helper signature is
```js
module.exports.register = function(Handlebars, options, params) {
Handlebars.register('awesome', function() {
return params.assemble.options.foo;
};
};
```