Updated to MW1.22.0

Changelog
* Updated the core to 1.22.0.
* Updated the WindowsAzureSDK and WindowsAzureStorage extensions to the
* latest version.
* Fixed a bug with parameter type in AzureFileBackendList class
  constructor in WindowsAzureStorage extension.
* Changed web deploy parameter names to user friendly names.
* Added few validations for web deploy parameters.
* Removed the azure host parameter since it is not required in the latest
  extension.
* Changed the values of "Enable MediaWiki file upload" and "Use Windows
  Azure storage as file backend" parameters to Yes/No instead of
  True/False.
* The "mw-config/index.php"  file will be replaced with the default file
  (WebInstaller) after installation. Since command line is not available
  in Windows Azure websites, this will help the users to upgrade MediaWiki
  using the upgrade key through browser.
* The WpiSettings.php file will be deleted once the installation is
  completed.

This is a package release, thanks to Pravin Deshmukh

Change-Id: Ia75ac6170bb85d17fe79495c02c183a908adeb5b