update version to v0.4.6

support iframe

update to v0.4.4

stop support contentEditable for IE8

update Caret.js to v0.0.4

fix some critial bugs

update version to 0.4.1

update description for v0.4.0

fix ie bug of caret

checkout changelog `2013-08-07 - v0.3.2`

for bower