Add cors functionality

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.

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)

Arguments

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

Arguments

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