Bump nokogiri from 1.7.2 to 1.8.0
Bump nokogiri from 1.7.2 to 1.8.0

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.7.2 to 1.8.0.
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.7.2...v1.8.0)
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