Fix silly error in RGB example
Bump revision
Incorrect attribute in framerate docs
Closes #18

RPIO can't be supported at this time; it currently refuses to recognize
GPIO 5 in either BCM or BOARD mode (a patch is required for py_gpio.c's
mapping constants by the looks of it; file upstream)
Closes #20

Split installation instructions into versions for Python 2 and 3, and
updated Python 2 instructions to use pip instead of easy_install (given
that pip now seems to be the favoured solution for installations, but
isn't yet available for Python 3)