Importance groups specified per template type

```
types: [
    {name: 'news', groups: ['standard', 'big', 'very big', 'huge']},
    {name: 'news/auto'},
    {name: 'news/most-popular'},
    ...
````
Config tool UI:

![fronts-tool](https://cloud.githubusercontent.com/assets/1147913/3031709/a5224074-e04f-11e3-9568-6836a6872554.png)