Enhancements:
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* Whitelist the CPU_COUNT environment variable. #1149
* Add tool for examining prefix length in existing packages #1195
* Add a conda interface layer for better compatibility with conda 4.2 #1200 #1203 #1206
* Document how to run tests #1205
* Update default versions for R (3.3.1) and Perl (5.20.3) builds #1220

Bug fixes:
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* Don't compile .py files in executable locations.  Compile one at a time.  #1186
* Don't force download if vcs is used as a source #1212
* Break hardlinks as a post-install step.  Hard links can cause problems at package install time.  #1215
* Make environment variables used by conda in environment creation always be bytestrings #1216 #1219