Fixed a few of bugs for ie6~ie10

#### Fixed list
--------
1. Add a sample 
1. Add `ieSupport`. This feature provide the `ie` and `ie<version>` **class** for the `.ps-container` element. It's convenient to figure out the ie's css issues.
1. Add `.hover` for ie6 to support the `:hover` pseudo class.
1. $el.outerHeight() and $el.outerWidth(), also the $el.prop('scrollHeight'), retrieve an incorrect value in ie7 because of the 'hasLayout' problem. 
1. Fixed the follow bug: win7 ie10/xp sp3 ie7 can not scroll the scollbar when the mouse is over the blank area.
1. Fixed scrollbar's height for ie6.
1. Fixed scrollbar's position for ie6.