Constructor passed an object with dependencies instead of as parameters

I was looking to add the feature in myself, but I'm not very clear on your code base and not sure how it would fit in.

As an alternative to passing in dependencies to a constructor as each dependency being a parameter, and thus possibly creating a very unwieldy constructor signature, it would be nice if the dependencies could be passed in as an object.

As an example:

``` javascript
exports = module.exports = function(deps) {
...
};

exports['@requireObj'] = [ 'foo', 'bar' ];
```

And then `deps` would look like:

``` javascript
{
foo: {},
bar: {} // or whatever the instance is supposed to be
}
```

Start by tracing how constructors receive dependencies and how the @requireObj metadata is interpreted. Define the expected behavior for the foo/bar example, including whether existing parameter-based injection remains supported, then add tests showing that an object of named dependencies is accepted.

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