fix for multiple wideareas on a single page

You need to remove the class "widearea-fullscreened" from the targeted textarea on closing the full screen text area in order to allow for multiple "wideareas" on a single page.
enable tabbing when in full screen mode
Merge pull request #9 from victorgama/master

Enable default value bug and fix some bugs
Merge pull request #6 from bvogelzang/patch-1

Enable tabbing in full screen mode
Merge pull request #4 from beastburn/patch-1

Fix multiple wideareas on a single page