Current Version locks Nokogiri to 1.6.8.1 (Security Vulnerability)

Current version 0.5.2 has runtime dependency version of azure-storage (0.11.5.preview) used Nokogiri gem (version ~> 1.6.0) that has multiple serious security vulnerabilities. Please update the azure-storage dependency at least to version 0.12.2.preview that dropped Nokogiri dependency at all, therefore eliminating a problem.