Apparently we are hitting a memory issue.
Apparently we are hitting a memory issue.

Let's try adding more memory to maven job as explained at http://stackoverflow.com/questions/36218635/maven-fails-with-error-process-exited-with-code-137.

```
-Xmx256m -XX:MaxPermSize=512m
```

Related to #250.

kneubi/fscrawler,dadoonet/fsriver,dadoonet/fsriver,dadoonet/fscrawler,dadoonet/fsriver,kneubi/fscrawler,dadoonet/fscrawler,kneubi/fscrawler,dadoonet/fscrawler