Add to handy script to automatically migrate to automatic package restore. 

I wrote this script and saved myself hours of tedium, so I wanted to share it. If you think this is appropriate, please merge it into the docs. If not, no hard feelings. 
Can you change this text to A) give yourself credit for providing the script, and B) make it clear that it's a community-contributed tool that is not supported by the NuGet team?  Perhaps:

Many users have requested a migration tool to disable the MSBuild-based package restore and convert to Automatic package restore. The NuGet team has decided not to provide a supported tool for this because of the high probability of edge cases that would be unhandled.  However, [Owen Johnson](https://github.com/owen2) has authored a PowerShell script that can work in many cases.  It's available [on GitHub](https://github.com/owen2/AutomaticPackageRestoreMigrationScript/) and can be used at your own risk. In other words, before to commit to source control before running it, just in case it doesn't work in your scenario.