Patch for Sinon-IE (IE7-9)

From Sinon docs:
>When faking XHR with IE you also need sinon-ie-1.8.2, which should be
loaded after sinon-1.8.2.js.

This fixed IE7~9 for me. My [current build](https://travis-ci.org/SergioCrisostomo/mootools-core/builds/20012221) has now IE7 & 8 also.

Got another [suggestion here](https://github.com/cjohansen/Sinon.JS/issues/409#issuecomment-36567328). Maybe you want to checkout also.