Ensures fog does not pickup Nokogiri 1.6
Ensures fog does not pickup Nokogiri 1.6

Nokogiri 1.6 drops support for Ruby 1.8.7 which is supported by the CLI.

Due to an issue in LibXML 2.9, Nokogiri vendors version 2.8 instead
which may interfere with bundling the correct version with packages.

brightbox/brightbox-cli,brightbox/brightbox-cli