added raspberry-pwm
Merge branch 'dev' into dev-pwm

* dev:
  many minor doc updates and tiny refactorings
fabfile: clean()
Merge branch 'dev' into dev-pwm

* dev:
  fabfile: clean()
started hacking on pwm.c. can add and remove pwm-gpios at runtime
start rpio-curses
RPIO tcp socket callback bugfix
RPIO tcp socket callback bugfix
rpio-curses update
finished rpio-curses beta