Auto merge of #110 - nox:image, r=emilio
Auto merge of #110 - nox:image, r=emilio

Update image to 0.12

<!-- Reviewable:start -->
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/glutin/110)
<!-- Reviewable:end -->

servo/glutin