Allow to use custom API URL

[dimitrystd]

Current sdk doesn't allow to specify custom API URL for tests purposes. Also we should keep interface of php sdk consistent with other sdk. DoD:

• [ ] Add one more constructor to SmartlingAPI class

public function __construct($baseUrl, $apiKey, $projectId) {}

• [ ] Add support of "Locale Based Approval" feature. This feature includes to parameters for upload service
  • localesToApprove - With this new parameter we can specify for which locales all strings into file will be approved, for all other locales strings will be excluded. Example:

curl -k -F "file=@test.xml;type=text/plain" "https://api.smartling.com/v1/file/upload?apiKey=********&projectId=5bf7d71e4&fileUri=test.xml&fileType=XML&localesToApprove[0]=ru-RU&localesToApprove[1]=da-DK"

• overwriteApprovedLocales - you must set this parameter false. In this case api will care about locales that were approved before
  • [ ] The current uploadXXXX implementation allows to pass any parameters

public function uploadFile($path, $fileType, $fileUri, $params = array());
public function uploadContent($content, $fileType, $fileUri, $params = array());

But will be much easy to use some parameters builder, like

$paramBuilder = new FileUploadParameterBuilder();
paramBuilder.fileType($fileType)
  .fileUri($fileUri)
  .callbackUrl($callback)
  .localesToApprove(array('ru', 'es-ES'));
  .overwriteApprovedLocales(false);

uploadFile($path, $paramBuilder);

You can find example of implementation there

• [ ] /example.php is updated
• [ ] FileUploadParameterBuilder is covered by unit-tests
• [ ] uploadXXXXare covered by unit-tests

[cr0ss]

I believe this functionality is implemented and works well.