Revert "Merge pull request #160 from opscode/sersut/update-nokogiri"

This reverts commit 176fcf00d09968300dceb2842666b0c86e4e6c6f, reversing
changes made to a8004e235f7e0eb2febb91dcb4d8eba2fce1b66c.
Merge pull request #161 from opscode/sersut/revert-nokogiri-bump

Revert "Merge pull request #160 from opscode/sersut/update-nokogiri"