Fix #288

Replace the default engine (net-based) by the vert-engine.

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Fix #378

Upgrade jackson version to 2.4.4

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Some work about #288

Test and documentation cleanup

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Fix #383

Protect the Jackson Repository from NPE when leaving.

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>