Helene's changes

Andrew,

These changes aren't merge-worthy -- I created this pull request just so you can see them if you like.  Most of the changes I made are merging your changes in, but I made a few others (all in carousel.js):
- Lentil controls (but not as add-on)
- Automatic rotation for the carousel (but not as an add-on)
- Allowing for focusing content within carousel items
- A couple conditionals to prevent some errors in IE8