v5.1.1

Adds the following:

• attach routes, filter lists and error handlers to functions
• converts function params to required types using route and query params
  • custom converters supported
  • converter config supported
  • mapping argument names to different param names supported
• supports body parsing and applying it to an argument
• allows for multiple generic response formats using the Accepts header
• allows for multiple generic posted content formats using the Content-Type header
• unique route and param errors