2.0.0

• Default behavior only checks X-HTTP-Method-Override header
• New interface, less magic
  • Can specify what header to look for override in, if wanted
  • Can specify custom function to get method from request
• Only POST requests are examined by default
• Remove req.body support for more standard query param support
  • Use custom getter function if req.body support is needed
• Set Vary header when using built-in header checking