Support nominative date formats.

[mattcoley]

Some languages have two version of months (nominative and genitive). By default, JDK8 uses genitive format which can cause issues. This allows you to use %OB instead of %B to get the nominative version of the month name.

[codecov-io]

Codecov Report

Merging #330 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #330      +/-   ##
============================================
+ Coverage     71.51%   71.56%   +0.05%     
- Complexity     1576     1578       +2     
============================================
  Files           239      239              
  Lines          4957     4966       +9     
  Branches        800      802       +2     
============================================
+ Hits           3545     3554       +9     
  Misses         1126     1126              
  Partials        286      286

Impacted Files	Coverage Δ	Complexity Δ
...ubspot/jinjava/objects/date/StrftimeFormatter.java	88.5% <100%> (+1.32%)	20 <0> (+2)	⬆️

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[anev]

LGTM

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.56%. Comparing base (5f9cfbb) to head (a8181c8).
⚠️ Report is 2546 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #330      +/-   ##
============================================
+ Coverage     71.51%   71.56%   +0.05%     
- Complexity     1576     1578       +2     
============================================
  Files           239      239              
  Lines          4957     4966       +9     
  Branches        800      802       +2     
============================================
+ Hits           3545     3554       +9     
  Misses         1126     1126              
  Partials        286      286              

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