Setup CI flow from Shippable to Heroku

[pwalsh]

Requires https://github.com/okfn/opentrials-ebola-tracker/issues/3

Tasks

• [ ] Make changes as a PR
• [ ] Configure yaml file for shippable
  • https://app.shippable.com/projects/5604ab341895ca447417f700
• [ ] Revert back the changes we made in package.json between dependencies and devDependencies, and the postinstall stuff that is related to it
• [ ] Configure the flow from shippable build to Heroku deploy
  • [ ] Only deploy from master branch
  • [ ] Document the process
• [ ] Integrate Shippable badge to README
• [ ] As well as test runner, setup code coverage to run on shippable

[pwalsh]

@roll you can also make the other changes that you did in the tracker repo (npm run scripts, renaming to app, etc.), as these are great, but just ensure you do it as a PR so we don't mess with @kravets-levko's work. thx.

[roll]

@pwalsh

I've closed the same Ebola issue so I suppose we can continue CI/CD talk here.

I've implemented tests/coverage reporting:

[pwalsh]

Yes, thanks @roll. we'll keep this open, but don't spend more time on it - I'll search for a better alternative.