Rename toxenv files to envlist

[ryanhiebert]

Fixes #80

[codecov-io]

Codecov Report

Merging #83 into master will increase coverage by 5.73%.
The diff coverage is 87.09%.

@@           Coverage Diff           @@
##           master   #83      +/-   ##
=======================================
+ Coverage   77.27%   83%   +5.73%     
=======================================
  Files           5     5              
  Lines         198   206       +8     
  Branches       46    48       +2     
=======================================
+ Hits          153   171      +18     
+ Misses         38    29       -9     
+ Partials        7     6       -1

Impacted Files	Coverage Δ
src/tox_travis/envlist.py	94.93% <100%> (ø)
src/tox_travis/after.py	70.93% <75%> (+13.09%)	⬆️
src/tox_travis/hooks.py	92.59% <88.88%> (+5.92%)	⬆️

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[rpkilby]

Two thoughts:

• A part of my says the output should be tested for the warnings, but it seems straightforward enough to honestly not warrant tests.
• Would it make sense to name the files envlist instead of detect? eg,

  from envlist import detect_envlist

Those considerations aside, 👍

[ryanhiebert]

Yeah, I've got to figure out how to test this section. Right now the after feature is considered "experimental", so I don't have it fully tested (especially the hooks and monkeypatch).

envlist was the original plan, as I specified on #80. My main driver for doing something different was #84, considering how I'd like to spell that flag. I like --auto-envlist less than --detect, and --envlist isn't a clear option IMO. Avoiding multiple words was something that I liked with --detect. Perhaps the flag needs to be --detect-envlist (or the negative). In that case it would be multiple words, but I'd have no issue renaming the files to envlist then.

[ryanhiebert]

As I noted on #84, envlist is a good name for the feature, so I've updated this PR to use envlist as the name that we're renaming toxenv to.

[ryanhiebert]

I'm glad that I added tests for the changes in travis:after. There were some bugs that needed to be addressed.