[WIP] Learn -> Explore, Footer logo rearrange, Landing Page

- [x] need new chalkboard image from Jess that repeats better for new landing page.
- [x] need final Mayor copy and image
- [x] need video link for video button
- [x] need to downsize landing page img (currently ~ 1MB)
- [x] consider making blue banner in CSS...alternate sizes included for [WIP] mobile version
![screen shot 2013-05-29 at 1 14 56 am](https://f.cloud.github.com/assets/1004790/577003/8e69c3dc-c81f-11e2-8b04-df4acb0918d3.png)

Bad image repetition on large display:
![screen shot 2013-05-29 at 1 28 34 am](https://f.cloud.github.com/assets/1004790/577024/bfe44102-c820-11e2-9c2c-a5a5c4e7b875.png)