add exaspim qc example

[saskiad]

closes #1293

[saskiad]

This is making an example of a QC annotation for the exaspim neuron reconstructions. I'm happy to see if there are better ways to do this (ala curation) but trying to squeeze the info that that team is looking to track into the system.

[dbirman]

Yeah everything here looks good as far as code -- but I agree with the sentiment that this isn't quite what we want to use QC for and we need another kind of structure for these kinds of annotations. I think this Curation object idea is the solution. Something to discuss more soon since we might want to squeeze it into 2.0.

I also I don't know why but one of the other examples files (that you didn't touch here) is out of date and causing the tests to fail. I pushed an update for it to the PR.

Edit: for some reason the tests are still failing... not sure what's going on because they work on my local machine.

[saskiad]

yeah, I'm confused by the tests failing because I had everything synced to be up to date ... but I'll need to look at them again and figure out what's going on.
I'm meeting with the exaspim morphology folks tomorrow, so I'll show them this and see if they have other needs for their curation. Do you want to join?