#7 - UI for defining the course - Initial TreeView

Conflicts: mtraining/src/main/java/org/motechproject/whp/mtraining/service/impl/DtoFactoryServiceImpl.java
#7: Added treeView functionality, updated relation service, created IT for the controller
#7: Modified treeView UI
Revert "#11: fixed Location related tests"

This reverts commit eb8b32544e697b0bb239b7f1fcc2f3f591612c77.
#12: added level property for location, fixed adding locations via import provider
#12 Fixed import 'valid selection options' in questions
#12: added fetching locations by level
#13 Location now displays correctly