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
Noteable change. To use the hk2 verticle factory it is now mandatory to add the java-hk2 prefix. I haven't tried to use the "java" prefix here as well. I'm not sure which verticle factory would be selected in this case.