Improve readme. #2
Merge pull request #6 from uberVU/2-improve-readme

Improve readme.
Mention no deps in the readme.
Mention AMD support in README. #2
Support regular script including alongside requirejs. #1
Fix typo. #1
Use opts object arg. #1
Remove event listeners in shutdown method. #1
Support observing on a given DOM node. #1
Refer to removedNodeHandler in opts. #1
Properly support event handlers. #1
Pass in the mutation target to the mutation handler. #1
Support attribute filter in non MutationObserver fallback. #1
Indent 4 spaces. #1
Add tests. #1
Mention testing in readme. #1