Implement GNU readline bindings

[phanimahesh]

twidge update takes a quoted argument or accepts input on stdin. But while useing the input stream, editing is a pain since it support just the absolute minimum.

GNU readline library can be used to implement extensive editing features. Aquick search indicated that a haskell binding exists through System.Console.Readline

Will it be possible to use this to provide better editing features?

I have limited experience with haskell, but may attempt a hack in spare time. User input welcome.