GitVersion fails to install in non-core project.json project

[twsouthwick]

I'm using project.json for a non-core project since it's easier to manage dependencies. However, GitVersionTask fails to install with the message:

Package GitVersionTask 4.0.0-beta0007 is not compatible with net45 (.NETFramework,Version=v4.5). Package GitVersionTask 4.0.0-beta0007 supports:
  - linux (linux,Version=v0.0)
  - osx (osx,Version=v0.0)
  - win32 (Windows,Version=v3.2)
One or more packages are incompatible with .NETFramework,Version=v4.5.

I took a look at the structure of the nupkg and saw that it is:

│   GitVersionTask.dll
│   GitVersionTask.dll.config
│   GitVersionTask.nuspec
│   GitVersionTask.pdb
│   [Content_Types].xml
│
├───build
│   ├───dotnet
│   │       GitVersionTask.targets
│   │
│   └───portable-net%2Bsl%2Bwin%2Bwpa%2Bwp
│           GitVersionTask.targets
│
├───lib
│   ├───linux
│   │   └───x86_64
│   │           libgit2-381caf5.so
│   │
│   ├───osx
│   │       libgit2-381caf5.dylib
│   │
│   └───win32
│       ├───x64
│       │       git2-381caf5.dll
│       │       git2-381caf5.pdb
│       │
│       └───x86
│               git2-381caf5.dll
│               git2-381caf5.pdb

Putting the libgit2 libraries under lib seem to mess it up as it thinks it only supports Linux/osx/win32 which does not align with the framework names (ie net45). I got it to work by moving the lib folder under the build/[framework] folder:

│   GitVersionTask.4.0.0-beta0007.nupkg
│   GitVersionTask.4.0.0-beta0007.nupkg.sha512
│   GitVersionTask.nuspec
│
└───build
    ├───dotnet
    │   │   GitVersionTask.dll
    │   │   GitVersionTask.dll.config
    │   │   GitVersionTask.pdb
    │   │   GitVersionTask.targets
    │   │
    │   └───lib
    │       ├───linux
    │       │   └───x86_64
    │       │           libgit2-381caf5.so
    │       │
    │       ├───osx
    │       │       libgit2-381caf5.dylib
    │       │
    │       └───win32
    │           ├───x64
    │           │       git2-381caf5.dll
    │           │       git2-381caf5.pdb
    │           │
    │           └───x86
    │                   git2-381caf5.dll
    │                   git2-381caf5.pdb
    │
    └───portable-net+sl+win+wpa+wp
        │   GitVersionTask.dll
        │   GitVersionTask.dll.config
        │   GitVersionTask.pdb
        │   GitVersionTask.targets
        │
        └───lib
            ├───linux
            │   └───x86_64
            │           libgit2-381caf5.so
            │
            ├───osx
            │       libgit2-381caf5.dylib
            │
            └───win32
                ├───x64
                │       git2-381caf5.dll
                │       git2-381caf5.pdb
                │
                └───x86
                        git2-381caf5.dll
                        git2-381caf5.pdb

I understand this is duplicating the files, but the install will work on non-core projects using project.json if done this way