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* fix conda skeleton cran --update-outdated --output-dir .
* add argcomplete completers for recipes, --python, --numpy, --R, CRAN
packages (with conda skeleton cran), and PyPI packages (with conda
skeleton pypi)
* conda develop now relinks object files on OS X (490)
* allow a glob for always-include-files
* allow an extra section in meta.yaml, with free-form content (483)
* don't echo environment variables when building on Windows (274)
* add conda build --skip-existing
* show default in help for conda skeleton --output-dir
* add --update-outdated option to conda skeleton cran
* skeleton: fix noarch_python option when build_comment is ""
* don't allow to build a package with the conda-meta directory
* automatically remove a package of the recipe itself if it is installed as
a build dependency
* allow 'extra' key in meta.yaml, see 483
* move echo command in Windows build, see 274
* add regex to always included files, see 484
* add strings in conda.config.non_x86_linux_machines, e.g. "ppc64le",
as selector variables (renames armv6 to armv6l)