Fix/detach#13

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shaohua wants to merge 5 commits intomasterfrom

Commits on Oct 9, 2014

Add one more test for detach callback
Shaohua Zhou
committed
Add mutationObserver polyfill
Shaohua Zhou
committed
Add more tests for attach and remove callbacks
Shaohua Zhou
committed

Commits on Oct 10, 2014

Add comments
Shaohua Zhou
committed
Add tests for multiple addChild and removeChild
Shaohua Zhou
committed