Initial Release

Added

• start and start-async functions to serve incoming socket RPC requests
• defprocedure to create new procedures that can then be called remotely
• respond and error for server-side procedures to generate responses
• socket-io private function to handle reading and writing to server sockets
• execute private function to parse the request and decide whether the request
  is a single procedure call or a batch
• do-single and do-batch to separate individual calls, and execute, before
  arranging return JSON
• execute-single to execute the map representation of a single procedure call,
  if it is valid
• when-valid executes its body if the input to execute-single is in a valid
  JSON-RPC request format
• named-params and positional-params organise input parameters into a
  consistent format, before calling the procedure defined by defprocedure
• with-server macro for clients to call procedures on a server
• notify can be wrapped around a procedure call if a client does not want a
  response
• socket-io to send a request to the specified server, then read the response,
  organising responses by id in the case of a batch.
• read-all handles reading the character count at the top of the response, then
  reading an appropriate number of characters based on that count
• parse-body converts the body of a with-server block from clojure function
  form to JSON-RPC form, checking for validity
• README with basic API documentation