add 40.10 osx layout
Merge pull request #146 from fricy/DF2014

add 40.10 osx layout
Update README.md
Log to stderr on Linux systems.

This fixes #114 and removes the write to the current directory that
places files where users may not expect.

I assume that Linux users are familiar enough with the command line to
run a program and output errors to a file via 2>file or similar.