Add support for continuous integration

To utilize the validation test I have added a Travis CI script. This way
this repository, as well, is tested with continious integration.

Signed-off-by: Konrad Reiche <konrad.reiche@fokus.fraunhofer.de>
Change nodejs command to node

Build failed, probably because the default command/binary name is node
and not nodejs.

Signed-off-by: Konrad Reiche <konrad.reiche@fokus.fraunhofer.de>
Add JSV dependency to the build script

...and another mistake. I forgot to add the JSV dependency.

Signed-off-by: Konrad Reiche <konrad.reiche@fokus.fraunhofer.de>