Updated link to a working example and license info.

The htmlpreview example no longer works. Updating to a working example link (pending a gh-pages pull/merge/push). Updated license and copyright years, changed art.sy to artsy.

For gh-pages you should be able to do this (haven't tested):

```
git checkout master
git checkout --orphan gh-pages
git rm -rf *
rm .gitignore
git pull git@github.com:dblock/jquery.fillwidth.git gh-pages
git push origin gh-pages
```