Fixed invalid file name characters
- FileUtils: added the cleanFileName method.
- FileUtilsTest: added a simple unit test for the cleanFileName method.
- GalaxyWorkflowEngine: use the new cleanFileName method in the downloadOutputFile method.
- HistoryUtils: use the new cleanFileName method in the downloadDataset method.
- DefaultWorkflowEngineFactory: constructor is public (in case you want to use it without dependency injection).
- pom.xml: small textual changes.