Package `NUglify.Tasks` in the NuGet package

[dkotaev]

Hello,

Could the assembly NUglify.Tasks.dll be packaged in the NuGet package? AjaxMin did the same, and dotnet projects were able to reference it as a build step with <UsingTask>. Currently, I would have to build from source and add NUglify.Tasks.dll as a reference to include it in the build process.

[trullock]

Make a PR 👍