Force UTF-8 encoding for all Ruby 1.9 stuff

When you get some wired errors with encoding, for instance

Encoding::InvalidByteSequenceError: "\xC3" on US-ASCII

You can force Ruby to use UTF-8 encoding by:

export RUBYOPT=-Ku

After that you should restart your application.
I suggest to add this line into environment/profile or your shell config file.

echo "export RUBYOPT=-Ku" > /etc/profile