v0.4.6

• BUGFIX: Hooks that accept a value argument (postroute, preserialize,
  and postserialize) now modify the incoming value as documented.
• BUGFIX: The postserialize hook is now given the serialized data as its
  value parameter.
• BUGFIX: properly handle cookie expiration values (#216).
• Add support for tags in Swagger docs (#230).
• Optional swaggerCallback parameter for run() to supply a callback function
  for reporting the url for swagger page.
• Add RStudio Project Template to package