Refactor to use functions, fixes #2; set up subcommand dispatch, fixes #3

example/example.sh

@@ -5,11 +5,12 @@ source=$(dirname "${BASH_SOURCE[0]}")
 pushd "$source" &> /dev/null
 
 # Build example image
-docker build . -t test-image &> /dev/null
+echo "Rebuilding docker image for example"
+docker build . -t infogulch/test-image &> /dev/null
 
 # Execute docker artifact to add a label to /app/othertestfile.txt
 set +e
-../docker-artifact.sh test-image /app/othertestfile.txt
+../docker-artifact.sh artifact label infogulch/test-image /app/othertestfile.txt
 
 popd &> /dev/null