Update src/Ivory/GoogleMap/Services/Directions/DirectionsRequest.php

Set language for directions's intructions are in the specified language
Update src/Ivory/GoogleMap/Exception/DirectionsException.php

Set language for directions's intructions are in the specified language
Update src/Ivory/GoogleMap/Services/Directions/Directions.php

Set language for directions's intructions are in the specified language
Remove trailing whitespaces
Add tests for directions request language
Merge pull request #6 from egeloen/f-directions-request-language

[Directions] Add language parameter to the request