BUGFIX: Always use nokogiri version 1.6.8.1 in Ruby 2.0.0
BUGFIX: Always use nokogiri version 1.6.8.1 in Ruby 2.0.0

(cherry picked from commit 8195566cfa81e9e335db5b2985f600c18110ef4c)

Seikitsu/gooddata-ruby,Seikitsu/gooddata-ruby,Seikitsu/gooddata-ruby,vhtien/gooddata-ruby,vhtien/gooddata-ruby,vhtien/gooddata-ruby