Add a context-initializer option to set up subscription context #148
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The ability to customize at subscription startup the context that will be passed to subscription interceptors was lost in the upgrade to Pedestal 0.7. Restore that functionality with a new option to
subscription-websocket-endpointthat allows users to provide a function that is given access to the base context, the session and the config object and returns an updated context. Since the function signature is not compatible with the old:init-contextoption, the new option is named:context-initializer.See also #41; the use case here is the same.