Enhancements:
-------------

* raise ValueError when pin_subpackage is used, but no matching output is found  #2720
* Add new optional CLI argument, --extra-deps, to add test-time dependencies dynamically when splitting build and test phases (can't apply variants when phases are split)  #2724

Bug fixes:
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* fix cran skeleton py2 invalid list copy syntax  #2720
* reconfigure TravisCI to test against conda master  #2720
* fix inaccurately raised problems with pin_subpackage  #2720
* coerce boolean values in conda_build_config.yaml to booleans (value.lower() == "true")  #2723
* change r skeleton cran test to a different package (nmf -> acs); nmf got removed
* fix selectors being applied before variable detection, leading to variables in selectors never being detected  #2723
* add filesize calculation to converted script files  #2727