package: use loopback-workspace from npm
example: slow down Google Maps API request

Limit the rate of the requests sent to Google Maps API in order to
prevent OVER_QUERY_LIMIT errors.
Merge pull request #16 from strongloop/feature/fix-google-map-rate-limit

Feature/fix google map rate limit
property: fix array type

The correct notation is `['string']` instead of `'[string]'`.