Crog/jpa config update

A new PR against master instead of old gutterball-hibernate branch.

Old PR is #750
This should be done the same way Candlepin was done. We spent a bit of time making Candlepin use the common configs.
See CandlepinModule https://github.com/candlepin/candlepin/blob/master/server/src/main/java/org/candlepin/guice/CandlepinModule.java#L170

```
       install(new JpaPersistModule("default").properties(config.getNamespaceProperties("jpa.config")));
```