with-readline 0.1.1 (new formula)

Adds a formula for with-readline which adds readline support to tools
that don't have readline support like the OSX native sftp.

This depends on readline and fooling about with {C,LD}FLAGS was the
way I figured out to make this build. Criticism appreciated.
To test readline functionality, I need to figure out how to do interactive (like expect) in Ruby. I could just run `with-readline sftp` for example but that tells me no more than `--version`. I have however put in a test with the OSX-provided expect which does not link with readline.