Enable running on OpenShift

I tried to deploy the application on OpenShift, but it didn't work due to some problem in the lastfm-java code:

```
(...)
Caused by: de.umass.lastfm.CallException: Caching/Reloading failed
    at de.umass.lastfm.Caller.call(Caller.java:246)
(...)
```

When run locally via Maven's Jetty plugin everything works fine though.
