Restructured baggers js

I restructured `baggers.js` file in a more natural way: baggers and cities are now separate lists:
```
var data = {
    "baggers": [ ... ],
    "cities": [ ... ]
}
```
Baggers have a new attribute `cities`, which is a list of *city names*, for example:
```
        {
            "name": "Camille Roux",
            ...
            "cities": [
                "Paris",
                "Montpellier"
            ]
        },
```

I think it's a lot more natural to organize this way. 

- The `baggers.html` page still needs the old format, so I added a helper function to rebuild that. 
- I did the same for baggers and rh/baggers. 
- I had to rewrite most of the unit tests. 
- I also fixed the coding style to follow the conventions used in the project (camelCase naming, 4-space indents).
- I noticed that `baggers.html` already had `lodash` in it, so I started using it in the new utility methods and in unit tests

Please test carefully before merging.