remove trailing slash from base model
format volume model
add volumes router
add back forward slash divider

/provider/:id/identity:/id/volume —>/<— :id.  It’s important, though I
do want to remove it for the collection case.
volume route works
remove trailing slash from base collection
add missing dependency
refactor to only have trailing slash when model has an id
add instance router
remove routes now in other routers
fix loading screen for volume detail view
fix loading screen for instance detail page
comment out non-existent router for now

todo: make this change correctly.  If any actions in the controller are
used it will probably throw an error.