Updated comment in AnssCatalog schema from 1.2rc3 to 1.2
Added internalEvent and scenarioEvent elements to eventParameters
Updated CubeToQuakeml and QuakemlToCube converters to handle internal messages
Added unit test to verify internal eqxml converts to internal quakeml
Reformatted comment wrapping
Merge pull request #9 from jmfee-usgs/internal_events

Things look good.

Since a quakeml message may not have both internal and non-internal events, it may be worth checking the `getEvents` method returns an empty list of events in your test.

``` java
Assert.assertTrue("quakeml has no non-internal events", 
    quakeml.getEventParameters().getEvents().size() == 0);
```

Note: Though both `internalEvent` and `scenarioEvent` were added to the `EventParameters` in the schema, only the former is handled with the remained of this code.