Merge branch 'master' of git://github.com/psychopy/psychopy
RF: attributeSetter for Window.recordFrameIntervals
RF: attributeSetter for Window.blendMode
RF/ENH: attributeSetters for Window methods.
DOC: updated doc for Window.color and Window.colorSpace
DOC: Window.gamma
ENH: a few new attributeSetters for Window.
DOC: added doc for checkTiming.
Merge pull request #598 from lindeloev/master

attributeSettters for visual.Window