Ripped out CA cert features, all certs now come from the OS or are provided by the user in .user-ca-bundle
Added fallback from WinINetDownloader to UrllibDownloader on Windows
Made the x509 parser compatible with Python 3
Added function to parse an x509 subject
Fixed a bug in falling back from the WinINet downloader to the Urllib downloader
Changed Windows certificate export to use crypt32.dll instead of certutil.exe
Fixed typo in OS X certificate export
Changed unicode_to_os() to not raise a deprecation notice with Python 2.6
Fixed access violation in ST2 with Windows crypt32 code for CA certs, refactored x509 parsing to be more complete
Updated the OS X certificate export process to not have to invole the openssl cli program for every cert
Removed the openssl_binary setting since it is no longer needed
Removed the "certs" key from the channel JSON and bumped the version to 3.0.0