I am trying to create a nuget package using http://docs.nuget.org/docs/creating-packages/creating-and-publishing-a-package#From_a_convention_based_working_directory as a ref
You can also try setting the system variable path to the location of your nuget exe and restarting VS.
PATH
variable and add the location of your nuget.exe (for me this is: C:\Program Files (x86)\NuGet\Visual Studio 2013
)I would have posted this as a comment to your answer @done_merson but I didn't have the required reputation to do that.
In [Package Manager Console]
try the below
Install-Package NuGet.CommandLine