Enhancements:
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* add support for a "recipe log" file.  This will be used at Anaconda to capture the commit activity of a given recipe, which will be published in the RSS feed.  #3123

Bug fixes:
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* fix indexing of noarch subdir as done by conda-forge  #3120
* decode cached index files to utf-8 before reading JSON  #3121
* try to address unicode problems in run_exports handling  #3121
* skip over index metadata files when they are not present in a package  #3125

Contributors:
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* @msarahan