added test of posterior distribution for ragged dmnorm conjugacy
added test of posterior distribution for ragged dmnorm conjugacy

NLMichaud/nimble,nxdao2000/nimble,nxdao2000/nimble,NLMichaud/nimble,nimble-dev/nimble,NLMichaud/nimble,nxdao2000/nimble,NLMichaud/nimble,nimble-dev/nimble,nimble-dev/nimble,nimble-dev/nimble,nimble-dev/nimble,nxdao2000/nimble