Launch script

Create a `start.sh` script.

Something like

```
#!/bin/bash
export CLASSPATH=pikes-tintop-1.0-SNAPSHOT-jar-with-dependencies.jar
export CLASSPATH=$CLASSPATH:Semafor-3.0-alpha-04.jar
export CLASSPATH=$CLASSPATH:models/stanford-corenlp-3.5.2-models.jar
java -Xmx8G eu.fbk.dkm.pikes.tintop.server.PipelineServer
```