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

* Add new jinja function for extracting information from files with regular expressions #1443

Bug fixes:
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* Quote paths in activation of build and test envs #1448
* Fix source re-copy (leading to IOError) with test as a separate step #1452
* Call conda with an absolute path when gathering metadata for package about.json #1455
* Don't strictly require conda-env to be present for about.json data #1455
* Fix version argument to skeletons not being respected #1456
* Fix infinite recursion when missing dependency is either r or python #1458