Include pollyfill for getElementByClassName

[p4bl1t0]

I think it's a great a idea to pollyfill getElementByClassName for standars in IE8

Some ideas: http://ejohn.org/blog/getelementsbyclassname-speed-comparison/

[WebReflection]

there are many polyfills out there for this method. Not sure it should be part of this one which aim is to normalize DOM Level 2 Events.

I'll think about it though ... if that's the only thing missing to have a better env won't hurt. Right now, it's a won't fix