Fix issue #93.

[dhs-rec]

I guess this SHOULD fix issue #93. However, I couldn't verify it because the build fails with

% ./gradlew build
> Task :compileGroovy FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileGroovy'.
> Could not resolve all files for configuration ':compileClasspath'.
   > Cannot resolve external dependency commons-io:commons-io:2.5 because no repositories are defined.
     Required by:
         project :

[dhs-rec]

After adding Maven Central as external repository I could build the plugin so that I found another flaw which is fixed with the 3rd commit. The plugin now resolves NuGet.exe through our local Nexus server by providing nugetExePath AND version inside the nuget{} block.

[dhs-rec]

Any chance this will be merged in the near future?