Travis CI testing fails because of missing 'secrets.js' require in server/index.js

When travis tries to test and deploy from the tracked repository, testing fails because we can't require `secrets.js` in `server/index.js`.

Workaround to check if not in testing environment in `server/index.js:`
```javascript
/*
    config keys for development
*/
if (process.env.NODE_ENV !== 'production' && process.env.NODE_ENV !== 'test')
    require('../secrets')
```