dpython and idpython block

[dowski]

Waiting on background events doesn't work in dpython or idpython. I'm pretty sure that both are calling raw_input() and blocking the event loop.

Need to investigate using diesel.util.stream and fitting that into the diesel.interactive code (which dpython and idpython use).

[dowski]

dpython is unblocked as of a1ed7ed.

Still need to figure out how to do non-blocking console input for IPython.