Fix some compile warnings
XD-1481: Move analytics-pmml to dedicated repo
Add javadoc to ModuleOptionsMetadata
Enable BatchInitializer by default

- Provide option in xd-config.yml to disable batch initializer
- Remove initializeDatabase flag from application.yml
Update spring-xd-yarn xd-config.yml

- Update batch initializer config in spring-xd-yarn's xd-config.yml
   - Have it commented out by default
Set the contextPath to "".

Jolokia currently doesn't work if contextpath is set to /management.
Once XD-1494 has been resolved by Spring boot 1.2.1, we will need to set the
context path back to /management.
Enable parallel tests

- Modify RandomConfigurationSupport's deleteFiles to print stacktrace in case of failure while
deleting
- Increase `forkEvery` to 20 in case of spring-xd-shell
- Running -PmaxParallelForks=<?> improve build time depending on the dev machine configuration
XD-1488: Add test for module environment insulation
Reverted one change from "Fix some compile warnings"