Merge pull request #22 from meghanlarson/master

MMLC-68 Use base url so that we can run on prod. Clean up.
Merge pull request #23 from meghanlarson/master

MMLC-68 correct configuration for using mathjax-node
Merge pull request #24 from meghanlarson/master

Add endpoint
Merge pull request #25 from meghanlarson/master

Extend timeout
MMLC-68 Start app.
Merge branch 'master' of https://github.com/benetech/mmlc-experiments
Merge bootstrap changes.
New spinner.