62 restore data table

[chriswhong]

• Implements react-table to create a paginated table view to complement the map view.

• Moves navbar into App, so view button clicks can be handled

• Creates a top-level state property rows, which is used by the new Table component.

• Refactors /tiles/initialize endpoint to return rows instead of featureCount (featureCount is calculated in the client from rows.length)

• For geojson mode, rows is calculated from the FeatureCollection once it is received in the client.

• Cleans up unused dependencies

Closes #62

[chriswhong]

1) yarn.lock is committed, we shouldn't commit both yarn.lock and package-lock.json 2) I think both the map and the table view should be grayed out or something if there is no result being displayed... we should make an issue for this, but I'm fine leaving it as-is for the time being.

[brianbancroft]

Both good explanations. Merging!