* Fix absolute paths for Cygwin
Absolute paths on Windows take the form "c:\somePath" -- these need to be mapped to the form "/cygdrive/c/somePath" on Cygwin. Otherwise, the virtualenv path gets garbled when activated on Cygwin, which can cause the wrong Python environment to be used.
* Remove Cygwin from the list, rely on the shell script for that
* Improved formatting
* Update tests to handle mingw + msys explicitly
* Add changelog entry
* lint errors
* Add msys support to the activation script
* Fix script error & linting