MRG: Add circle-CI

[larsoner]

Add CircleCI doc building, with an artifact of the new docs. This should hopefully make it easier for e.g. @rgommers to critique my mediocre docstring plots.

Closes #6129.

Produces this:

https://circle-artifacts.com/gh/Eric89GXL/scipy/27/artifacts/0/home/ubuntu/scipy/doc/build/html-scipyorg/generated/scipy.signal.remez.html#scipy.signal.remez

[rgommers]

That looks good, thanks Eric!

1500 build minutes a month may be borderline, but we'll see how far we get with a free account I guess.

[larsoner]

I've been using it on another repo for a couple of months with fewer PRs/commits but probably longer build times and so far we've been okay, so I'm optimistic. I'll go ahead and merge and activate in a couple of days unless there are other comments.

[rgommers]

For reference, here is the TravisCI artifacts support: https://docs.travis-ci.com/user/uploading-artifacts/. Summary: it doesn't store artifacts, only supports uploading to Amazon S3. Hence CircleCI is better in this regard.

We currently only build the docs after a PR is merged (to update the dev docs on docs.scipy.org).

[rgommers]

in it goes, thanks @Eric89GXL

[larsoner]

@rgommers can you enable CircleCI on their website? I don't think I have sufficient permissions

[rgommers]

done, building at https://circleci.com/gh/scipy/scipy/1 now

[rgommers]

Eh, make that failed at https://circleci.com/gh/scipy/scipy/1

Reading state information... Done

Note, selecting 'libpng12-dev' instead of 'libpng-dev'
libatlas-base-dev is already the newest version.
libatlas-dev is already the newest version.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 liblapack-dev : Depends: liblapack3 (= 3.5.0-2ubuntu1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

sudo apt-get install libatlas-dev libatlas-base-dev liblapack-dev gfortran libgmp-dev libmpfr-dev libfreetype6-dev libpng-dev zlib1g-dev texlive-fonts-recommended returned exit code 100

Action failed: sudo apt-get install libatlas-dev libatlas-base-dev liblapack-dev gfortran libgmp-dev libmpfr-dev libfreetype6-dev libpng-dev zlib1g-dev texlive-fonts-recommended

[larsoner]

Oh yeah, can you also set it to use 14.04 instead of 12.04? It's in the settings for the project on CirceCI

[larsoner]

Looks like I had permission to change it, so I did. Next build will hopefully work.

[larsoner]

I rebased and push forced #5989 so hopefully we see it work there

[rgommers]

Worked like a charm this time.

[pv]

Doesn't seem to be working now: https://circleci.com/gh/scipy/scipy/5 https://circleci.com/gh/scipy/scipy/8

[pv]

Or maybe it just needs rebases.

[larsoner]

Yeah it looks like it doesn't build the merge version which is surprising.