removing billiard for now.
Adding analytics code/badge
Tiny cosmetic formatting change to readme
Merge branch 'master' of https://github.com/pupil-labs/pupil
Minor cosmetic updates to simple player scripts.
Adding “fixations only”  flavored simple player scripts.  Less noisy visualizations based on a manhattan distance metric to measure difference in movement between current point and past points.
make git_tag_version now return “unknown” instead of None on failure to be more type consistent.
Merge branch 'master' of https://github.com/pupil-labs/pupil
small speed improvement
fix bug that skewed gl display of images loaded on linux machines
started work on marker detector.

TODO:
	map makers in planar view
	get code/invent code (colors?)
	investigate a marker that’s more stable to motion (possible with edge based tracking?)
adding perspective transform
added perspective transform
adding marker decoding fn
add rotation of marker to marker transformation matrix
cosmetics
small tweak for robustness
cosmetics
cleanup of unneeded imports
adding transforms to and from marker space