implement `position` api for contentEditable
build a source file without coffe mapping
Merge branch 'dev'
fix html escaping while mirroring caret

close #29
Merge branch 'dev'
calculating in iframe's coordinate

Instead of parent window's.
The fact is that caret.js will not calculate the iframe's offset.
Merge branch 'dev'
update version to v0.2.0
merge updates from official
Merge pull request #1 from teambition/update

Pull updates from official