Fixes #67 & #69 (IE8 perfomance issues).

[gzigzigzeo]

No description provided.

[JangoSteve]

Can you please explain this change? Internally in jQuery, .delegate() is just a one-line piece of code that calls .on(). I.e. what you changed doesn't actually do anything, unless they changed that in jQuery 1.8, in which case, I'd like to know what the change is to cause this patch to make a difference.

[gzigzigzeo]

I can not logically explain it, but this change worked for me in real project. My idea was that IE8 delegate() is internally reserved method or something like this. I know that it's the black magic, so the only meaningful use of this patch is to replace deprecated calls to delegate() with calls to on().

[JangoSteve]

delegate() is not deprecated and I prefer it to on(). I'd rather know why something is broken/works before changing something that shouldn't make a difference.