Setting to nonblocking

[bsngardner]

Reading the source, the functions appear to support non-blocking by calling the function readchar() with parameter wait_for_char=False, but this leads to an error saying that the function did not expect a parameter. This functionality is not defined in the documentation either. I did install the module through pypi, I don't know if that affects my result. This could be clarified and hopefully fixed since non-blocking is what I am looking for.