(includes changes since 2.0.12, including those already listed under 2.1.0beta1)

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

* Consolidate package metadata from extra.json and noarch.json into package_metadata.json #1535 #1539
* finalize paths.json, (formerly files.json), which supersedes the older separate files for tracking file data #1535
* Support output of multiple packages from one recipe #1576
* Support output of wheels #1576
* Add ``--prefix-length`` to conda-build.  This allows one to set the prefix length manually.  It should be used sparingly, preferring creation of a temporary folder on non-encrypted locations, and setting ``--croot`` to that temporary folder.  #1579
* Add ``--no-prefix-length-fallback`` option to conda-build, to fail builds that encounter short prefixes, rather than falling back to the short prefix #1579
* Change CRAN-skeleton to follow conda-forge style #1596
* Allow relative paths to files in source/url field #1614

Bug fixes:
----------

* Rework locks to be more robust #1540
* Call make_hardlink_copy on Windows to prevent conda failures #1575
* Delete the work folder before running the test suite.  Exposes faulty links to source files more easily.  #1581
* Add support for Python 3.6 in selector expressions #1592
* Don't try to compile pyc files when python is not installed in the build env #1593
* Fix a function call leading to corrupted meta.yaml output #1589
* Fix logger to be package-local.  Fixes logger output not showing up.  #1583
* Disallow leading periods in package version  #1594
* Fix reference to undefined need_source_download #1595
* Disallow - in feature names, to avoid conflicts with conda's handling of package names #1600
* Remove help text about passing multiple --python options or "all" - this has been broken for some time.  Replacement coming in 3.0.0.  #1610
* Fix clobbering of no_link variable.  #1611
* Fix index when --output-folder is specified #1613
* Fix python_d.exe incompatibility with conda 4.3 #1615