Release v0.2.0

• Update README with better statement about where to put scripts
• Use native style property of event instead of jQuery's css-fn
• Use Math.floor instead of parseInt for better calculation
• Remove unnecessary variable, make factor calculation faster
• Add translateZ(0) to scroll operation to use GPU
• Remove throttle function and add necessity check
• Add meta viewport in visual test
• Swap $scrollTop variable to $scrollBottom in $scrollBottom block of code
• Probably fixes scrollTop issues with Firefox
• Make it faster
• Use spaces instead of tabs
• Update parallax script path in test/index.html