kwlist are inspected as a list of tuples with raw: true

As discussed on the elixir-talk list:

    iex(1)> Kernel.inspect [a: 1,b: 2], raw: true
    "[{:a, 1}, {:b, 2}]"
    iex(2)> Kernel.inspect [a: 1,b: 2], raw: false
    "[a: 1, b: 2]"
    iex(3)> Kernel.inspect [a: 1,b: 2]            
    "[a: 1, b: 2]"