Merge branch 'master' into 0.28

Merge branch 'master' into 0.28

Improve URLs for Chart and Dashboard ModelViews (apache#5544)

* Improve URLs for Chart and Dashboard ModelViews

Prior to this, the ModelView for Chart and Dashboard would be
at `/slicemodelview/list/` and `/dashboardmodelview/list/`.

Now we have cleaner URLs at `/chart/list/` and `/dashboard/list/`

* Fix unrelated js lint

* addressing comments