CouchbaseTemplateSupport does not log exceptions thrown by CouchbaseMappingEvent Listeners correctly

[aaronjwhiteside]

CouchbaseTemplateSupport#maybeEmitEvent and CouchbaseTemplateSupport#maybeCallBeforeConvert

both contain

			} catch (Exception e) {
				e.printStackTrace();
			}

[mikereiche]

Will fix this after datacouch-955 to avoid merge conflict.