32 frontpage slideshow

There are a lot of changes in here. 

To functionally test:
* [ ] Pull down the 32-frontpage-slideshow branch.
* [ ] Run drush updb
* [ ] Generate ~100 nodes for test content using devel generate:
```
drush generate-content 100 4 --types=announcement,article,page,download,project,video
```

* [ ] Enable nodequeue generate and populate the nodequeue:
```
drush en nodequeue_generate
drush nodequeue-generate-all
```
* [ ] Open a browser and (logged out) visit the front page of the website.

This should produce a frontpage similar to this:
![uas_frontpage_slideshow_screenshot](https://f.cloud.github.com/assets/171437/1072763/cd83a9b4-1498-11e3-9523-4d1576dacf5e.png)