initial wip on data reference

frontend/src/metabase/Routes.jsx

frontend/src/metabase/app.js

frontend/src/metabase/components/Navbar.jsx

frontend/src/metabase/components/SidebarLayout.jsx

frontend/src/metabase/css/core/colors.css

frontend/src/metabase/css/home.css

frontend/src/metabase/questions/containers/EntityBrowser.jsx

frontend/src/metabase/reference/ReferenceApp.jsx

...end/src/metabase/reference/containers/ReferenceEntity.jsx

...c/metabase/reference/containers/ReferenceEntityEditor.jsx

...src/metabase/reference/containers/ReferenceEntityList.jsx

frontend/src/metabase/reference/fixture_data.delete.js

npm-shrinkwrap.json

package.json

webpack.config.js