[BUG] Readd DATABASE_URL to app.js
[CHORE] Add DATABASE_URL env variable to .travis.yml.
[CHORE] Add Travis CI build image to README.
[CHORE] Add postgres addon to Travis.
[CHORE] Remove pm2 module from package.json
Merge branch 'master' into http-api-tests
[CHORE] Bump gateway-data-sequelize dependency.
[CHORE] Add KEY env variable to Travis CI.
[CHORE] Add KEY env variable to Travis CI.
[CHORE] Add grunt and db setup to Travis.yml.
[CHORE] Add db-migrate command to Travis.
[BUG] Require setKey in getKey api call.
[TEST] write basic status code tests for HTTP controllers
[CHORE] refactor to take callback
[CHORE] refactor to take callback param
[CHORE] refactor startGateway function to take callback.
[FEATURE] generate wallet via the http controller.
[CHORE] update http call to set hot wallet on callback
[CHORE] fire callback with error or processes
[BUG] update method name to startGateway