don't use `JsonProvider.getPropertyKeys(Object)` to query a list/array's indexes
Merge branch 'master' of github.com:jayway/JsonPath into get-property-keys-for-maps-only
Merge pull request #53 from jochenberger/get-property-keys-for-maps-only

don't use `JsonProvider.getPropertyKeys(Object)` to query a list/array's indexes