correct NuGet install verbosity parameter

[eltjo-k]

When the verbosity option to the NuGet Install command is set to NugetInstallVerbosity.Quiet the following message is shown:

C:\...\tools\NuGet\nuget.exe install C:\...\packages.config -outputdirectory "./packages/" quiet -prerelease -nocache -nonInteractive -configFile "./tools/nuget/nuget.config"
install: invalid arguments.
usage: NuGet install packageId|pathToPackagesConfig [options]

The problem is that instead of the word quiet there should be written -verbosity quiet. This is corrected in this pull request. One of the following three options is now added to the NuGet Install command:

-verbosity detailed
-verbosity normal
-verbosity quiet

[forki]

thanks for taking care of this!