move project page to master from gh-pages.

not nessary to have a gh-pages project.
improve contentEditable for IE 8

I don't want to spend more time on IE 8.
So it would be the ending fixup. And i will still leave related code for
a while maybe in case anyone want to help to improve it.
Just encourge your users to upgrate the browers or just switch to a
batter one please !!
update to v0.4.4

stop support contentEditable for IE8