Fix token color customization for CodeRay >= 1.1.0

See: https://github.com/rubychan/coderay/commit/e2acec3ef141725d2fc264e56d1aa18e838c6acf
     https://github.com/pry/pry/issues/1012#issuecomment-29213405
Compare version numbers properly
Revert "Merge pull request #410 from treppo/master"

This reverts commit 6e344fef4e00914d3a2e8955f48cf5ca7479a945, reversing
changes made to 4c88ca6e45dfb9b2bd80f1ff3eebd84e7b5d885d.