CI TODO List for R1

[jonascheng]

• [x] Apply Mocha to enable TDD by creating test cases when creating new functions
• [x] NPM install mocha in root folder and write an dummy test case
• [x] Initial Travis CI and make sure trigger on each submission
• [x] Prepare test cases for survey
  • [x] get one survey model
  • [x] post a new survey model
  • [x] update a survey model
  • [x] delete a survey model
  • [x] list all survey model
• [ ] Enable ESlint in CI
• [x] Enable code coverage in CI