example: fix sample-data/import script

The server app calls the import script during the boot process.

This commit fixes `node server/sample-data/import` to not call the
import second time.
example: add geo to sample locations

This speeds up the application startup and prevents timeout errors
when running end-to-end tests on the build server.
Merge pull request #43 from strongloop/feature/add-geo-to-location-sample-data

Add geo to location sample data