Merge pull request #2 from developit/develop

Merge puredom.animationFrame fixes.
Merge branch 'develop'
Merge branch 'develop'
1.2.6: Improvements for mixin()

- Fix puredom.mixin() regression introduced in version 1.2.1
- Added support for alternative "decorator-first" mixin syntax:
mixin(true, [deco, ...] obj)