Fix documentation regarding exit() and draw() [#1197]
Updated QuickStart links + a typo fix

QuickStart links pointed to 404s; also, “relatively links” → “relative links”
rebind Processing.instances when processingInstances is cleared
Added PVector.sub() perf was 311ms now is 190ms! Remove sub PVector unit tests from PVector.pde to PVector-sub.pde and added a whole bunch more unit tests for sub.
Fixed bug 1828 and added unit test
Fixing failure on firefox documentXUL when you tried to override document.head
InstanceOf was failing inside a firefox extension
Bug 1923 - Ignore image type in loadImage
fix bug 1821
fix bug 1935
PVector additions with tests for p5 API parity [#1981]

fromAngle, heading, lerp, magSq, random2D, random3D, rotate, setMag
comment cleanup
	new file:   examples/basic/multipointerevents.html
	new file:   examples/basic/pointereventsimple.html
	new file:   examples/basic/pointereventsmultipoint.html
	new file:   examples/basic/simplepointerevents.html
	modified:   processing.js