Add Charge.outcome

[blueyed]

TODO:

• fix/adjust migration

[codecov]

Codecov Report

Merging #515 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #515      +/-   ##
==========================================
+ Coverage   99.39%   99.39%   +<.01%     
==========================================
  Files          34       34              
  Lines        1829     1831       +2     
  Branches      166      166              
==========================================
+ Hits         1818     1820       +2     
  Misses          5        5              
  Partials        6        6

Flag	Coverage Δ
#py27dj110	99.07% <100%> (ø)	⬆️
#py27dj111	99.07% <100%> (ø)	⬆️
#py27dj18	99.34% <100%> (ø)	⬆️
#py34dj110	99.07% <100%> (ø)	⬆️
#py34dj111	99.07% <100%> (ø)	⬆️
#py34dj18	99.34% <100%> (ø)	⬆️
#py34dj20	99.07% <100%> (ø)	⬆️
#py35dj110	99.07% <100%> (ø)	⬆️
#py35dj111	99.07% <100%> (ø)	⬆️
#py35dj18	99.34% <100%> (ø)	⬆️
#py35dj20	99.07% <100%> (ø)	⬆️
#py36dj111	99.07% <100%> (ø)	⬆️
#py36dj20	99.07% <100%> (ø)	⬆️
#py36dj20psql	99.07% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
pinax/stripe/models.py	100% <100%> (ø)	⬆️
pinax/stripe/actions/charges.py	100% <100%> (ø)	⬆️

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[blueyed]

Rebased, migration moved to depend on current master's 0014_blank_with_null.