Fixe some documentation and typos (#161)

* Fix download-catalog typo in Makefile
* Do not list deprecated docker_* commands in documentation
diff --git a/docker-compose/Makefile b/docker-compose/Makefile
index b7d199b..7f15bdd 100644
--- a/docker-compose/Makefile
+++ b/docker-compose/Makefile
@@ -65,7 +65,7 @@
 .PHONY: download-catalog
 download-catalog:
 	if [ "$(OPENWHISK_CATALOG_HOME)" = "./openwhisk-catalog" ]; then \
-	    rm -rf ./openwhisk-catalog* \
+	    rm -rf ./openwhisk-catalog*; \
 	    curl -O ./openwhisk-catalog.tar.gz -L https://api.github.com/repos/apache/incubator-openwhisk-catalog/tarball/master > ./openwhisk-catalog.tar.gz; \
 	    mkdir openwhisk-catalog; \
 	    tar -xf ./openwhisk-catalog.tar.gz --strip 1 -C openwhisk-catalog; \
diff --git a/docker-compose/README.md b/docker-compose/README.md
index d765ce2..22fafbe 100644
--- a/docker-compose/README.md
+++ b/docker-compose/README.md
@@ -87,13 +87,13 @@
 
 You can pull pre-built image
 ```bash
-make docker_pull
+make docker-pull
 ```
 
 This command pulls the docker images for local testing and development.
 
 ```bash
-make docker_build
+make docker-build
 ```
 
 This command builds the opewnhisk core docker images for local testing and development.