IE 10 Support

Hello there!

I've implemented a very basic IE support module that requires two lines in zepto.js to be changed. It works by adding the \__proto__ property to Object and referencing it to the objects prototype. I have only done quick testing of the code and found that everything works fine in currently supported browsers and I've only noticed a few animation problems in IE10.
I would like to point out that I'm only targeting IE10 since I am in full support of sticking to modern browsers and IE10 is a modern browser with a growing number of users so supporting IE10 with this small module that adds only a few lines of code would be a good move for Zepto. I would like to run a full suite of tests on IE but I'm currently working on projects that require my time and I only made this because of the reasons stated above.

I hope you like what you see and include the commits to the Zepto master branch.

Regards
Stefan Andres Charsley