Feature/general graph visualization

# New

- **General Graph Navigation** in the banner of each Topic on "Start to explore" click
  - Topic cover is replaced by the **General Graph Navigation**
  - Ability to filter by topic's models
  - Ability to return to the cover view
  - Use exactly the same graph render script used for entry visualization [directives/topic.single.graph.coffee](https://github.com/jplusplus/detective.io/blob/feature/general-graph-visualization/app/detective/static/detective/js/directives/topic.single.graph.coffee) 
- Assets are no longer compressed for development. Much easier to debug!

## Before Merging to Develop

- [ ] Test (on staging, with different typologies, new topic with few entries, old topic with a lot a entries...)
- [ ] Release the [v1.4.7](https://github.com/jplusplus/detective.io/issues?milestone=15&state=open)
- [ ] Test again !