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

* Add disable_pip build option to disable conda's automatic add of pip/setuptools #1311
* Add numpy to pypi env creation if it is imported in setup.py #1289
* Improve compatibility with conda >=4.2 regarding prefixes that are too short #1323
* Delete .pyo files prior to compiling pyc files.  They are considered harmful.  #1328
* Add ```conda build purge-all``` command that cleans out built packages and build folders #1329

Bug fixes:
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* Use source.get_dir instead of config.workdir for source_files (was one level too low) #1288
* Import setuptools in windows.py to apply vc9-finding monkeypatch #1290
* Fix convert not updating subdir in index.json #1297
* Update post-build deprecation warning to state 3.0 as release for removal #1298
* Create pkgs folder if it does not exist #1299
* Fix warn_on_old_conda_build to ignore non-final release versions (alpha/beta/rc) #1303 #1315
* Remove coercion of pycache folder into flat pyc files #1304
* Fix metadata retrieval in bdist_conda #1308
* Add supplemental removal of cached packages when conda does not fully remove them #1309
* Simplify updating the package index #1309
* Straighten out when metadata member config is used, relative to config argument #1311
* Catch prefix length errors with OpenSSL's custom prefix replacement program #1312
* Replace all colons with _ in git mirror folders to avoid Windows path errors #1322
* Fix missing file contents in converted packages.  Test.  #1325