#34 Tutorial timing in unix is very wrong.

[Tom Kaitchuck]

In Unix and Linux systems the tutorial's scripted
keypresses occur at very wrong times. This is because in
commands/tutorial/__init__.hpy on line 191 it calls
time.clock(), which on windows returns the elapsed wall
clock time, but on *NIX returns the elapsed cpu time used
by the current process. This should be replaced with a call
to time.time()