Fixed a few of bugs for ie6~ie10

#### Fixed list
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1. Add a sample 
1. $el.outerHeight() and $el.outerWidth() 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. Add `.hover` for ie6 to support the `:hover` pseudo class.
1. Fixed scrollbar's height for ie6.
1. Fixed scrollbar's position for ie6.