Enhancements:
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* break build string construction out into standalone function for external usage (Concourse CI project) #1513
* add conda-verify support.  Defaults to enabled.  Adds conda-verify as runtime requirement.
*

Bug fixes:
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* handle creation of intermediate folders when filenames provided as build/source_files arguments #1511
* Fix passing of version argument to pypi skeleton arguments #1516
* break symlinks and copy files if symlinks point to executable outside of same path (fix RPATH misbehavior on linux/mac, because ld.so follows symlinks) #1521
* specify conda executable name more specifically when getting about.json info.  It was not being found in some cases without the file extension.  #1525