fix(webfuse): fix macros (#18)

* fixes return code on error

* fixes macro usage

* adds clean target

* fixes file mode

* fixes image name

* adds registry prefix to allow usage of custom registry (on-premise)

* changes syntax in travis file for package installation

* fixes duplicate settings discovery

build/get_container_id.sh

@@ -33,7 +33,7 @@ impl_container_id_by_cgroup() {
 DOCKER="${DOCKER:-docker}"
 
 if [ -z "${CONTAINER+x}" ] && [ -n "$DOCKER" ]; then
-  CONTAINER="$(container_id "$@")" || true
+  CONTAINER="$(container_id "$@")"
 fi
 
 echo "$CONTAINER"