Add integer rounding to match APE 14

[WilliamJamieson]

Fixes #524

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.40%. Comparing base (9cd8552) to head (3b30fc5).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
gwcs/api.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
- Coverage   87.42%   87.40%   -0.02%     
==========================================
  Files          22       22              
  Lines        3874     3876       +2     
==========================================
+ Hits         3387     3388       +1     
- Misses        487      488       +1     

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