Align graph crawled from wikipedia and tvtropes

align graph 'ExternelId' with datas of wikipedia and tvtropes.


I used `FixtureModule ` to ensure dependency between fixtures.

```
    f = FixtureModule('fx_works')
    f += fx_teams
    f += fx_genres
    f += fx_franchises
```


But I couldn't find any reason that using `f.session = fx_session`. 
So I will eliminate it.