KNL-1108 KNL-1109 KNL-1110
Add RepositoryService interface.
Add stubs for RepoItem, Folder and File model classes.
Add stub for RepositoryServiceImpl with stubs for methods to check whether start-up conditions are met.


git-svn-id: https://source.sakaiproject.org/svn/kernel@128484 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1108 KNL-1109 KNL-1110
Unsaved changes from previous commit.


git-svn-id: https://source.sakaiproject.org/svn/kernel@128487 66ffb92e-73f9-0310-93c1-f5514f145a0a