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

* Issue template created for github repo  #2632
* Detect overlinking (usage of libraries that are not present in listed dependencies).
  Warn by default.  Error out with --error-overlinking flag.  Conda-build 4.0 will
  error by default.  #2635 #2647

Bug fixes:
----------

* fix merge_build_host to always be used in CRAN skeletons  #2635
* fix macho filename attribute error  #2641
* reorder search through files for compatibility bounds for speed  #2638
* cache used vars based also on recipe path, to avoid overly caching results  #2643
* normalize slashes in file glob lists for explicit output file lists  #2644
* silence conda 4.4 better when using quiet operations, such as --output  #2645
* fix pypi_url not affecting the url of the actual skeleton output from conda skeleton pypi  #2646
* fix overly broad string matching of "None" that caused problems where None may appear
  as part of a string in meta.yaml  #2649