Merge branch 'scroll'
Add Documentation

Give some documentation on adding to your pages.
And explain what each file adds.
Minimize array.js

Well, minimize Array.prototype.indexOf and remove unwanted white space
around Array.isArray
Upgrade IE with HTML5 placeholder

Polyfill input[placeholder] for IE8/9 using jQuery or Zepto.js
Does not automatically apply after document ready...
Add Math.sign()

Function to find sign of a number
Returns NaN, 0, -1, or +1
Also add URL reference for Array.isArray()
Merge branch 'math'
Merge branch 'master' into scroll