Version updates in travis - #648

These failures a sort of mysterious to me, @bsipocz. The latest build has a new round of failures related to the escape sequence \o used in some docstrings.

Yes, those needed to be fixed in astropy and astroquery, too. Too bad I don't yet have py3.6 locally, so can only test it on travis.
The more puzzling issue (that I also see here astropy/astroquery#815) that using unittest seems to trigger a deprecation warning in pytest that it not yet fixed upstream. There are several cases of that here in halotools.

@bsipocz - I just took another look at this PR in light of #664. It looks like 3.6 compatibility requires including an r in front of any triple-quote docstring enclosing an equation. Do I understand that correctly? If so, do you know whether there are automated tools for this? Doing that manually would be onerous in the extreme :-\

@aphearin - Yes, there was a change with escape sequences, and py3.6 got a bit stricter, so we need to have raw strings in many cases (e.g with equations). Unfortunatelly don't know a tool to do this automatically (as one may need to change the docstrings themselves, too).
Anyway I can come back to this later next week again.

Well, that's a bit of a bummer.

FYI, my current release cycle is to try and get v0.5 out within the next couple of weeks, as I have several new features in the master branch that people seem to be using. I expect that v0.6 will not come until the fall, and I am perfectly fine postponing 3.6 compatibility until then. I don't want to stick you with this nuisance of a manual task either - I'm happy to just keep an open PR for a while that I periodically iterate on and rebase as needed.

@aphearin - OK, if you are happy with that let's keep this open. Don't worry, I sometimes need menial tasks to fall back on so I'll update this from time to time.

Same here. In order for me to help chip away at this, is the easiest thing for me to just submit PRs against this branch in your fork?

No need for PRs, you can push commits to this branch directly (as a maintainer).