Remove Travis CI configuration
Add Circle CI configuration
Replace Travis CI badge with Circle CI badge
Pin npm dependencies to exact versions
Merge pull request #10 from fastmonkeys/feature/circle-ci

Circle CI
Add comment model
Add api for getting comments
Add api for creating comments
Show comments in hearing page

This is just a raw version. The final version will be implemented
in Angular.
Remove main section from hearing

Simplifies hearing relationships.