#21 - OneBuild now finds the latest Invoke-Build NuGet package and invokes the build script using that.
#21 - OneBuild now finds the latest NuGet.Commandline NuGet package within the solutions NuGet packages folder and invokes nuget.exe from there.
#21 - OneBuild now finds the latest NUnit.Runners NUnit package within the solutions NuGet packages folder and invokes nunit.exe from there.
Merge branch '21-onebuild-has-hard-dependency-on-specific-nuget-packages'