Update Readme.md
Working in IE8

IE8 doesn't have window.Node. What a jerk.
Merge pull request #58 from anthonyshort/patch-1

Working in IE8
Merge branch 'master' of github.com:component/reactive
Merge pull request #48 from Nami-Doc/patch-1

Update Readme.md
Merge branch 'master' of github.com:component/reactive into interpolate-methods