Move to express

Not 100% done, but more or less everything is here

In order to try it out:

```
npm install
cp config/example.json config/development.json
node_modules/grunt-cli/bin/grunt db:import
npm test
npm start
```

Description of changes:

- Removes sails
- Re implements functionality in express
- Moves configuration out of app.js
- Fixes bug with the downloaded jar for the selenium-server