FIX: Docstring
FIX: Fix noise
Merge pull request #112 from Eric89GXL/play-sound

1. ENH: Remove Pyo for Pyglet, add Py3k support.  Ready to rebase the other PRs, @Eric89GXL?
ENH: Add HRTF convolution
FIX: Old numpy
FIX: Fix finding last idx
FIX: Rebase touch-up
ENH: Add window_edges
FIX: No print
FIX: Quieter example