Migration to Vert.x 3

Initial work on migrating this module to vertex 3 includes:

* Updating API
* Removal of module building
* Update of examples
* Removal of deprecated classes
https://groups.google.com/forum/#!msg/vertx/_y_VqFQOVhs/r8zce-zzds0J

> * Verticle factory simplification 
>
> There is no more `langs.properties`. Verticle factories are loaded from 
> the classpath using the service loader pattern. Verticle factories can 
> also be registered and unregistered programmatically.