Add support for resolving references from packages.config.

This changes adds a new ResolveNuGetPackages task that parses packages.confg
and resolves the packages and translates them into References for the project.

This commit also updates the BuildTools package version to 1.0.17.
Fix some formatting and copyright for the ResolveNugetPackages file
Merge pull request #32 from weshaggard/NugetResolve

Add support for resolve references via packages.config.
Add missing dependency of Microsoft.Web.XmlTransform in the BuildTools nuget package
Merge branch 'master' of https://github.com/dotnet/buildtools into NugetResolve
Merge pull request #33 from weshaggard/NugetResolve

Add missing dependency of Microsoft.Web.XmlTransform in the BuildTools nuget package