Oh, that's great!!

Ok, so this reveals many more problems with IE8. Out the gate there are 81 failures, though if I drop in [es5-shim.js](https://github.com/kriskowal/es5-shim/blob/master/es5-shim.js) this goes down to 10.

Do you have a preference as to whether to require es5-shim as a prerequisite for nunjucks on IE8?  It doesn't really matter to me because the project I'm using it for already uses es5-shim.

In the meantime I'll figure out what the remaining 10 errors are for.