Better description for the color fishtank demo

There was no way to know which color the fishtank demo needed to work, so just editing its description to explain it should use the magenta color.
Merge pull request #89 from mairatma/master

Better description for the color fishtank demo
Add ogv version of minion's video
Updates README

fixes href of image (mariatma --> pablocp)
Merge pull request #91 from cirocosta/patch-1

Fixes misleading image href
Update Canvas.js

Support Canvas Security Limit. http://www.w3.org/TR/cors/
Adds a maxDimension feature to ColorTracker. mergeRectangle returns rectangles that satisfy minDimension and maxDimension requirement
Sets default value for maxDimension
update tracking-min.js and tracking.js
Source formatting
Defaults found color rectangles max dimension to Infinity
Source formatting
Adds tests for color dimension constraints
Fixes docs
Build
Merge branch 'pr-94'