Channel store body content

This PR relates to issue https://github.com/jembi/openhim-core-js/issues/168
Works in conjunction with PR https://github.com/jembi/openhim-console/pull/183
Minor comment, perhaps we should change this text to read: "Rerun Transaction #" + transactionID + " - is not allowed to be rerun as we don't have enough information about the request." Just a bit more descriptive.