Add narrativeQA
@lhoestq this is now only failing some random windows test (it appears to be somewhere in wnut_17) This is a connection error, you can ignore it :) 
The level of activity on the lib is quite overwhelming, it stresses a bit the CI ^^
Redo of #1368 #309 #499

In redoing the dummy data a few times, I ended up adding a load of files to git. Hopefully this should work.