use CFRunLoop directly in `ipython kernel --pylab osx`...
use CFRunLoop directly in `ipython kernel --pylab osx`
via matplotlib.backend_macosx.TimerMac, rather than Tk
Fallback on Tk if matplotlib is < 1.1.0, which introduces the necessary Timer. This means that it still won't work on current EPD, which has X11-linked libtk and matplotlib 1.0.1,
but at least it will display a warning explaining why.
also remove caveat in docs that qtconsole doesn't work with native MacOSX, since it does on normal (non-EPD) installs.
So this will work in more places, but still not in most common failure case (stock EPD) described in
#640.
