WIP: JSONAPI prefix

[n2ygk]

Description of the Change

Per a discussion with @sliverc, renamed recently-added paginations class from JsonApi-prefix to JSONAPI-prefix. This includes new deprecation warnings for the old names.

I also added a minor fix to tox.ini not to run flake8 on the entire directory but only the relevant files.
You can cherry-pick that out if you prefer it not to be part of this PR.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added (no change; just class renamed)
• documentation updated
• changelog entry added to CHANGELOG.md
• author name in AUTHORS

[codecov-io]

Codecov Report

Merging #458 into master will decrease coverage by 0.1%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
- Coverage   93.24%   93.13%   -0.11%     
==========================================
  Files          54       54              
  Lines        3123     3134      +11     
==========================================
+ Hits         2912     2919       +7     
- Misses        211      215       +4

Impacted Files	Coverage Δ
example/tests/unit/test_pagination.py	100% <100%> (ø)	⬆️
example/views.py	91.89% <66.66%> (ø)	⬆️
rest_framework_json_api/pagination.py	89.06% <73.33%> (-5.28%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 96c533b...24bd89d. Read the comment docs.

[n2ygk]

Dammit every time I try a rebase I get something backward and now it shows 12 files being changed.

[n2ygk]

In general the way to get the best of both worlds is to rebase local changes you’ve made but haven’t shared yet before you push them in order to clean up your story, but never rebase anything you’ve pushed somewhere. -- https://git-scm.com/book/en/v2/Git-Branching-Rebasing

OK, merge it is from now on.

[sliverc]

Thanks for going to an extra effort to make DJA more consistent with the JSONAPI renaming.

Beside the small change I think we have to get the merge rebase issue sorted (PR currently contains changes of previous PRs) and this should be ready for merging.

Maybe to fix your rebase issue what you could do is to create a new branch based on master, then cherry pick the changes you actually made for this PR and force push to JSONAPI-prefix.

[sliverc]

flake8 configuration is to be found in the setup.cfg. I think for consistency we should move all options there.

[n2ygk]

I'll clean up my mess. Just found another small error in the deprecation warnings as well.

[n2ygk]

closing this PR so I can undo the rebase message and resubmit.