directly force_encoding is wrong,
must detect the file string's encoding.
then force_encoding the string to it's encoding.
last convert it to utf-8.

Do not install ruby-debug on travis-ci.org, it only wastes time

See http://about.travis-ci.org/docs/user/languages/ruby/ (the "Exclude non-essential gems like ruby-debug" section) for reasoning.

link "GITLAB" logo to root_url instead of '/'