ENH+TST Expand subfeatures when counting with a GFF file

[unode]

Using a GFF containing "gene_name=nameA,nameB" would result in:

nameA,nameB    1

Now the same results in:

nameA    1
nameB    1

This follows after https://git.io/vpagq and the case of:

Parent=AF2312,AB2812,abc-3

[unode]

Seems like we need to reactivate Travis. The move of the repository likely broke this.

[luispedro]

I re-authorized travis, so it works again.

(It also kept the history of the previous builds, which is cool, especially as the builds now print out a benchmark at the very end, so we can compare performance over time).

[luispedro]

The code looks good (I mean, this part of the code is very hairy because we are trying to handle so many variants at once that I don't see a way to do it very cleanly).

If the tests pass on your side, we can merge (and that will trigger the travis re-build, I think).