Improve h/1 IEx helper to handle some cases that were not handled before
Improve h/1 IEx helper to handle some cases that were not handled before

For example, this didn't work:

    iex(1)> h function_exported?/3
    ** (UndefinedFunctionError) undefined function: IEx.Helpers.function_exported?/0

kelvinst/elixir,michalmuskala/elixir,lexmag/elixir,ggcampinho/elixir,ggcampinho/elixir,kelvinst/elixir,kimshrier/elixir,gfvcastro/elixir,beedub/elixir,antipax/elixir,pedrosnk/elixir,pedrosnk/elixir,joshprice/elixir,antipax/elixir,beedub/elixir,lexmag/elixir,elixir-lang/elixir,kimshrier/elixir,gfvcastro/elixir