fix `cp -R` for cookbooks

trailing slash is key
log to "/var/log/chef.log" instead of $stderr

Chef already logs to console, so redirecting the log to $stderr resulted
in everything appearing twice.
improve readme
Merge pull request #2 from mislav/tweaks

fix and tweak
no sudo
Not verbose logging, back to stderr
Restore debug level option
Fix double stderr output
Fix copying of cookbooks on Debian-based systems
Merge pull request #3 from logicaltext/cp-r-for-all

Fix copying of cookbooks on Debian-based systems
use official Chef install script instead of RubyGem

On a fresh system, build tools necessary to compile Chef dependencies
are not yet available
a more comprehensive example