Package deletion fails if scripts are open in VS 2015 (0.3.5)

[drhaynes]

When trying to delete a package from the Projeny package manager, if the package contains a script, and it is open in Visual Studio, then the deletion will fail with message <directory> is not empty.

Presumably this is due to VS holding a lock on the file, preventing deletion.

Workaround:
Closing VS and trying to delete the package again seems to work.