BF: SoundPyo.sampleRate should come from server not from SoundPyo.__init__()

also improved some docs
Merge branch 'master' of github.com:psychopy/psychopy
Merge branch 'master' of github.com:psychopy/psychopy
DOCS: minor tweaks/typos
Merge branch 'master' of git://github.com/psychopy/psychopy

* 'master' of git://github.com/psychopy/psychopy:
  DOCS: minor tweaks/typos
  BF: SoundPyo.sampleRate should come from server not from SoundPyo.__init__()
DOC: coder demo style-guide (esp for OpenHatch event)

anything to add to this? tweak?
how about explicitly saying in each code demo that its public domain?