The editor extended with new features

We improved our rich text editor. Now it has following new features.

1. Added autosizing by height, editor area height will extend to content when your typing.
2. Added support for resizing images inside editor, just point any image with mouse cursor and then click and drag to change size.
3. Cleanup for pasted content. For example for text copied and inserted from Word.
4. Also we fixed some z-index issues.
5. Improved Firefox support.