0.4.19 release to npm

• New Similarity Search (Beta) Node
• New Language Translation Util mode, to request available translation models
• Translation Node now has option to look for global translation settings
• Enhancements to Conversation Node
  • Node has option to remember context
  • Context support for single user and multi-user models
  • Ability to reset context, including user specific reset
  • Ability to splice in additional context variables.
• Added Concept support to News Node