Fixes #118

- Link to CIP data in the readme was broken, this commit fixes
https://github.com/codeforamerica/ohana-api/issues/
- css/.sass-cache files were not being ignored. This adds those to the
.gitignore.
Reverts gitignore

Removes gitignore .sass-cache entry per
https://github.com/codeforamerica/ohana-api/pull/119#issuecomment-294843
58
Merge pull request #119 from codeforamerica/fix-readme

Fixes #118