skrollr plugin that adds some missing features to IE < 9

The plugin makes IE understand opacity, rgb() and hsl() (the ones with alpha are mapped to them) and it creates a very simple document.querySelector polyfill which only supports ID selectors (using getElementById). Needed if you want to use data-anchor-target.

Include dist/skrollr.ie.min.js after the core using conditional comments.

<script type="text/javascript" src="skrollr.min.js"></script>

<!--[if lt IE 9]>
<script type="text/javascript" src="skrollr.ie.min.js"></script>
<![endif]-->

• Fixed issues with opacity. The filter is now getting removed when opacity is 1 (#4).

• Reverted #3. Leaving the opacity filter on the element even with 100% keeps it from getting anti-aliasing (#1).

• Don't remove the opacity when it reaches 1 (#1, #3).

• Moved skrollr-ie to a dedicated repo.