Release 3.1.7

• Fix decimal and double #round method to round towards positive for negative numbers, as called for in XPath function.
• Update the public domain dedication information to indicate that it applies to all repositories in the organization, and requested on a PR.
• Update URI#relativize based on JSON-LD Context#remove_base. This covers more cases where the base URI can be used.
• Fix the graph passed to new terms
  • It always passed the RDF::Vocabulary class instead of the actual vocab