Merge pull request #166 from emavro/feature-appstore-client

Fixed support for XML update files
Merge pull request #168 from emavro/feature-appstore-client

Very basic work for compatibility with Hathor
Copy the URL from models/install.php to view InstallerViewInstall (and use the new one in layout)
Use JCANCAL instead of COM_INSTALLER_CANCEL_BUTTON
Merge pull request #169 from beat/feature-appstore-client

Now using new URL (updated to HTTPS CDN url) in layout, coming from view, and Removed specific "Cancel" language string
Merge pull request #171 from emavro/feature-appstore-client

Support added for Update XML files
Minor js change
Merge branch 'feature-appstore-client' of https://github.com/joomla-projects/joomla-cms into feature-appstore-client
Fixed Hathor regression due to Layout getting URL from View now instead from Model directly and to new loading spindle
Merge pull request #185 from beat/feature-appstore-client

 Fixed Hathor regression
Merge branch 'feature-appstore-client' of https://github.com/joomla-projects/joomla-cms into feature-appstore-client