* before_build:
Add documentation for CIBW_BEFORE_BUILD
Fix os/sys typo and use an absolute path on *nix too
Change version file path to absolute on Windows
Perhaps a filename collision
Check the path is okay on windows
remove redundant line
A little more debugging info for Windows
Add before_build option, that runs a shell command before 'pip wheel'
Don't run tests in a subshell so the errexit option applies
Run the pip version check in the right env
# Conflicts:
# README.md
Joe Rickerby