Merge pull request #15 from winappkits/master

Updating
Deregistered Share Link Event Handler

There was a problem on Windows 8.0 machines where registering a new
share event handler would throw an exception because the previous event
handler had not been removed when navigating from the previous view.
Merge pull request #56 from acrow59/master

Deregistered Share Link Event Handler
Share Link Event Handler Fix

Registration of the share link event handler was still failing on
certain machine where the class initializer was being called before the
prior class' event handler could be deregistered. Moving registration to
the OnNavigatedTo section fixes this as it's always called after the
previous class' OnNavigatedFrom function.
Merge pull request #57 from acrow59/master

Share Link Event Handler Fix