Fix for those with bad installs + Merge

For some reason my merge didn't go through.
Actually fix for bad installs
Fix right click friend + NA spectate + Multiple Launches
asdf
Update README.md
Bugs (Dunno)
 - Window not flashing when receiving message (Seems to work with this, dunno)
 - NullException at 'p as MainPage' Fixed
Update CONTRIBUTING.md
Merge branch 'master' of https://github.com/eddy5641/LegendaryClient
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Merge branch 'master' of https://github.com/eddy5641/LegendaryClient.git
Fixed Bugs

 - Fixed Window not Flashing when receiving message (Dunno)
 - Fixed NullException at 'p as MainPage'
easy fix
Merge branch 'master' of https://github.com/eddy5641/LegendaryClient.git
Merge branch 'master' of https://github.com/eddy5641/LegendaryClient
Changed a little
 - Added MahApps.Metro to be used as Main Style
You can add friends + instacall + public instalock
Merge branch 'master' of https://github.com/eddy5641/LegendaryClient.git
Stop creating new mainpage when pressing home
I missed a few
that looked bad