Update Naming Directives

Naming Directives should be updated to address several issues:

• remove references and examples based on obsolete "csprd", "cnprd", and "cos" notation
• clarify that URI-scheme XML namespaces may begin with either http: or https: (but not interchangeably)
• mention that use of lower-case "version" in place of "stage" is allowed
• Use "Project" rather than "TC"
• Update links and descriptions for HigherLogic workspace
• Rebuild the document in Markdown for simpler maintenance