Revisit/clean Travis/tox config

[blueyed]

No description provided.

[codecov-io]

Codecov Report

Merging #536 into master will increase coverage by 0.49%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #536      +/-   ##
=========================================
+ Coverage    85.6%   86.1%   +0.49%     
=========================================
  Files          33      33              
  Lines        1626    1626              
  Branches      140     140              
=========================================
+ Hits         1392    1400       +8     
+ Misses        178     173       -5     
+ Partials       56      53       -3

Flag	Coverage Δ
#dj110	80.25% <ø> (-1.6%)	⬇️
#dj111	83.33% <ø> (ø)	⬆️
#dj18	80.13% <ø> (-0.44%)	⬇️
#dj19	79.82% <ø> (-0.31%)	⬇️
#dj20	79.02% <ø> (ø)	⬆️
#djmaster	79.02% <ø> (ø)	⬆️
#mysql_innodb	78.9% <ø> (ø)	⬆️
#mysql_myisam	78.84% <ø> (ø)	⬆️
#postgres	81.61% <ø> (ø)	⬆️
#py27	83.27% <ø> (ø)	⬆️
#py34	79.82% <ø> (-1.36%)	⬇️
#py35	79.76% <ø> (+0.73%)	⬆️
#py36	79.15% <ø> (-2.16%)	⬇️
#pypy	80.93% <ø> (+0.49%)	⬆️
#pypy3	75.46% <ø> (-4.19%)	⬇️
#pytest3	?
#sqlite	80.93% <ø> (?)
#sqlite_file	78.78% <ø> (-1.67%)	⬇️

Impacted Files	Coverage Δ
pytest_django/fixtures.py	85.71% <0%> (+1.29%)	⬆️
pytest_django_test/db_helpers.py	82.4% <0%> (+3.7%)	⬆️
pytest_django_test/settings_sqlite.py	100% <0%> (+100%)	⬆️

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[blueyed]

Less jobs, more coverage. I like.