Basic blinking.
Define blink speed as a constant.
Replace 0/1 with FULLY_OPEN/CLOSED.
Merge pull request #574 from ey6es/master

Very basic eyelids/blinking.
Turns out sincos is a GNU thing.
Derp, need to bind the element array buffer.
Merge pull request #576 from ey6es/master

Fix for OS X.