Add full-stack framework Danf

Danf is a javascript/node full-stack framework providing many features in order to produce an evolutionary, maintainable, testable and performant code:

* An object-oriented programming layer.
* An inversion of control design (dependency injection via configurations files).
* A simple system allowing to use the same code on both the client and server sides.
* A homogeneous way to handle all kind of events (http request, dom events, ...).
* An elegant solution to callback hell preserving asynchronicity.
* A helper to develop performant ajax applications supporting deep linking.
* A modular approach to develop and use (open source) modules.