Try to preload scrool comment in divs.

Try to preload scrool comment in divs to avoid large DOM append.
Caculate top manually. Avoid to use getoffset

Something to do:
    update information when reset and change screen size
make
Create gh-pages branch via GitHub
Create gh-pages branch via GitHub
Merge branch 'preload' of github.com:Catofes/CommentCoreLibrary into preload
update resize function

still have bug:
clear();
Again
update reset. seems work good
add class container
update caculate text height & width

Still a little strange. Happen when danmu with veryvery big height.
Merge branch 'master' into preload
update src
reset css
Merge branch 'gh-pages' into preload

Conflicts:
	build/CommentCoreLibrary.js
	src/CommentCoreLibrary.js
Merge branch 'master' into preload

Conflicts:
	build/CommentCoreLibrary.js
	src/CommentCoreLibrary.js
just a test
reset back
maek
use canvas