Introduced a controller for revisions
Renamed the RepoApp to RepoController as this is afterwall what it is doing.
Tied the Revisions Controller into the Scalatra bootstrap.
Removed - unnecessary and create noise by leaving it lying around
Made the URLs more like Rails...
Bunch of changes for the first initial attempt at blending a diff view.
Fixed null pointer issue due to not initialising correctly.
Added a showdiff service which can deal with setting both the from and to revision.
More detail in the entry difference service completed.