Implement Java driver

[goetzst]

To be able to run Java transformations the following things need to be implemented

• code the AbstractDriver
  - read env variable
  - loads models
  - apply change
  - save results
• package it to lib ?
• write documentation for other languages
  • embed fuzzer so that solutions can test if they are correct on more case than the one we provide ?

[TheoLeCalvar]

pushed a basic version with #12
still need documentation

[TheoLeCalvar]

Update driver to add env variable to switch apply changes & transformation for correctness test.