Enhancements:
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* Support otool -h changes in MacOS 10.12 #1479
* Fix lists of empty strings created by ensure_list (patches failing due to empty patch list) #1493
* Improved logic to guess the appropriate license_family to add to package's index. This improves filtering. #1495 #1503
* Logic for the license_family is now shared between open-source conda-build, and proprietary cas-mirror packages. #1495 #1503

Bug fixes:
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* Centralize locks in memory to avoid lock timeouts within a single process #1496
* fix overly broad regex in detecting whether a recipe uses version control systems #1498
* clarify error message when extracting egg fails due to overlapping file names #1500
* fix regression where subdir was not respecting non-x86 arch (values other than 32 or 64) #1506