IE8 support

[dominicbarnes]

I needed this library to work with IE8. (because it's a dependency of yields/select) The changes here are not as drastic as I expected, so I hope it will be considered for inclusion.

• using component/each instead of Array#forEach
• using juliangruber/isarray instead of Array.isArray
• using innerText || textContent fallback for text
• using matthewp/text for tests (could not use in lib because document-fragments don't work like normal nodes in IE8)
• adjusted some unit tests to account for "differences" with IE8 (capitalizing tag names, etc)

All unit tests continue to pass in other browsers, and IE8 now passes too. (with one exception being the component/enumerable#25)

[bmcmahen]

+1 IE8 support is still necessary for most of my projects, too.

[matthewmueller]

sweet. unfortunately, this PR needs to be updated to use new jquery-like syntax. some stuff is no longer relevant either (like .text())

[dominicbarnes]

Ok, I can rebase off the latest commits to master and rework this.