as_draws()

[jgabry]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

Closes #532

Adds as_draws() methods for CmdStanR's fitted model objects. Since this is just a wrapper around fit$draws(), the only argument is ..., which is passed to fit$draws() (so can include variables, inc_warmup, format, etc.).

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):
Columbia University

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)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[rok-cesnovar]

Looks good to me. Merge once tests pass.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (9e41082) to head (81edaaf).
Report is 1120 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
+ Coverage   91.37%   91.94%   +0.57%     
==========================================
  Files          12       12              
  Lines        3233     3191      -42     
==========================================
- Hits         2954     2934      -20     
+ Misses        279      257      -22     

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