Update GoogleMapsBusinessProvider.php

Original line:
`$query = sprintf('%s&client=%s', $query, $this->clientId);`
...fails!

client ID parameter should be supplied as `client_id` and not `client`. 

New line:

`$query = sprintf('%s&client_id=%s', $query, $this->clientId);`
Update GoogleMapsBusinessProviderTest.php

Replaced instance of client with client_id (line 31 & 50)
Merge pull request #245 from userabuser/master

GoogleMapsBusinessProvider Client ID Fix