Replace "Run on build" setting in Visual Studio

[benquarmby]

The "Run on build" setting in JSLint.NET for Visual Studio can be quite confusing when coupled with the MSBuild targets of the NuGet package. They don't apply across both. The NuGet package is also far better and more consistent way to run JSLint on build.

Remove the "Run on build" and "Cancel build" settings and replace them with a way to install the NuGet package within Visual Studio instead.