replace cobertura parser with patched version

[fschwaiger]

This is related to, and should resolve #304.

I did not have time yet nor do I have the experience to run the tests for this.

[ryanluker]

@fschwaiger Thanks for the PR and the contribution!
I resolved the conflict with master, as there were some node versioning issues I fixed today.
Seeming the builds passed (cobertura is used for some integration level testing), I am fine to merge this in.

[ryanluker]

Thanks again for the contribution and the extension release 2.10.0 will hopefully happen within a week!