fix(jqLite): fix add/remove class in IE9

IE is not my favorite web browser.

this is my take on #5694 
According to http://msdn.microsoft.com/en-us/library/ie/ms536739(v=vs.85).aspx, 

> Windows Internet Explorer 8 and later. IE8 Standards mode enables several enhancements to the setAttribute, getAttribute, and removeAttribute methods that are not available when pages are displayed in earlier document modes.