minor changes

a) adjust indentation, change space to tab
b) change html class to make the naming convention consistent
c) fix the javascript bug (jquery .live() is deprecated after jquery
1.7, use .on() instead)
add icon for social buttons and adjust css
adjust js and css

put all the plugin css in main.css, other self-defined in styles.less
adjust css
remove scroller, just use "banner"

adjust corresponding css