Accept np.floating and np.integer for arguments

[WardBrian]

Submission Checklist

• Run unit tests
• Declare copyright holder and open-source license: see below

Summary

Closes #647. For our argument validation, we don't really care about the differences between int and np.int32 and friends, since we serialize to a string anyway.

Copyright and Licensing

Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):

Simons Foundation

By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)

[codecov-commenter]

Codecov Report

Merging #663 (20c57cc) into develop (087a765) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #663   +/-   ##
========================================
  Coverage    80.56%   80.56%           
========================================
  Files           69       69           
  Lines        10653    10653           
========================================
  Hits          8583     8583           
  Misses        2070     2070           

see 3 files with indirect coverage changes

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