Remote XML Items Files

Added ability to use an XML items file located on a remote server. It
works exactly the same as the LocalItemsFileService, except the rather
than using a local file, users can host their file somewhere else and
load the content in. This allows for Azure-like updating, without the
need for an Azure account.
XPCK App Builder - Icon Fix

The front end wasn't creating the Application Icon for the Windows
Phone. Now it does.
Merge pull request #11 from winappkits/master

Pull Request
Merge pull request #29 from acrow59/master

Add RemoteItems Service and Update XPCK Frontend