createFrame() in readme example has correct parameters
API summary tweak
quixote.md tweaks
QFrame.md tweaks
QElement.md tweaks
descriptors.md tweaks
Descriptor tutorial tweaks
Contribution guideline tweaks
INTEGRATE: Correction to readme example, other minor doc fixes

* dev:
  Contribution guideline tweaks
  Descriptor tutorial tweaks
  descriptors.md tweaks
  QElement.md tweaks
  QFrame.md tweaks
  quixote.md tweaks
  API summary tweak
  createFrame() in readme example has correct parameters
0.5.1