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)
Add support for cities in Yandex Provider
Add setMaxResults method
Fix tests
Merge pull request #248 from Baachi/limit

Add limit/setMaxResults method
Add more doc. Fix #242
Fix tests due to data changes
Merge pull request #247 from Koc/yandex-cities

Add support for cities in Yandex Provider
Merge pull request #245 from userabuser/master

GoogleMapsBusinessProvider Client ID Fix
Update CONTRIBUTING.md
Prepare 2.0.0 release
Bump version to 2.0.1-dev
Replace zendframework with zend-http
Update real testcase
Merge pull request #250 from Baachi/patch-1

Replace zendframework with zend-http
Merge pull request #251 from Baachi/patch-2

Update real testcase
Fix tests