This is a complete revolution in the dynamic rendering capabilities of conda-build.  More information is in the docs PR at https://github.com/conda/conda-docs/pull/414.  There will be a blog post soon, perhaps coupled with a screencast.

Enhancements:
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* greatly extended Jinja2 templating capabilities  #1585
* record environment variables at top of build.sh, similar to what is done with bld.bat in win.  #1765

Bug fixes:
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* fix symlinks to folders in packaging  #1775
* fix detection of patch level when maxlevel=0  #1796
* properly copy permissions when extracting zip files  #1855
* Add more important Windows environment variables to the test environment  #1859, #1863