Expect-like framework

 This is a simple implementation of `expect` to help building unitary testing
 of interactive program.
 .
 It helps to receive question and send answers from an interactive process.
 You can match the question using a regular expression (Str). You can also
 use a timeout to ensure that the process answer in time.
 .
 See the [Expect manual](http://expect.nist.gov/) for more information and
 example.