Merge pull request #41 from HarlanH/master

get gh-pages in sync
Merge pull request #42 from HarlanH/master

compressed images
Merge pull request #45 from HarlanH/master

index page text updates
Merge pull request #51 from HarlanH/master

C4DC logo
Merge pull request #52 from HarlanH/master

merge Sam's work on school and neighborhood filters
Merge pull request #59 from HarlanH/master

fix data errors
Merge branch 'gh-pages' of https://github.com/HarlanH/code-for-dc-edu