Allow contrib libraries to integrate into views/models/routers

[jackey]

as you know, in views/models/routers, there are a few pre-defined variables, like _, Bones, Backbone and they can be used in client side and server side.

But there is no way allow us add contrib library that like pre-defined variable in views/models/routers and share them on client and server side.

Do you have plan in future version ?