cors: Add cors functionality
In jug: A Simple Web Framework for R

Description Usage Arguments

Allows to set CORS-headers as specified in https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS. It will also setup the infrastructure in order to receive OPTIONS requests send to path.

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cors(jug, path = NULL, allow_methods = c("POST", "GET", "PUT", "OPTIONS",
  "DELETE", "PATCH"), allow_origin = "*", allow_credentials = NULL,
  allow_headers = NULL, max_age = NULL, expose_headers = NULL)

`jug`	the jug instance
`path`	the path to bind to
`allow_methods`	a vector of allowed methods
`allow_origin`	the allowed origin
`allow_credentials`	either `true` or `false` (supply as string)
`allow_headers`	a vector of allowed headers
`max_age`	in seconds
`expose_headers`	a vector of exposed headers