Avoid stomping on the last of multi-buildpack's release script

bin/compile

@@ -56,20 +56,11 @@ framework=$($dir/bin/detect $1)
 
 if [ $? == 0 ]; then
   echo "=====> Detected Framework: $framework"
-  $dir/bin/compile $1 $2 $3
+  $dir/bin/compile $BUILD_DIR $CACHE_DIR $ENV_DIR
 
   if [ $? != 0 ]; then
     exit 1
   fi
-
-  # check if the buildpack left behind an environment for subsequent ones
-  if [ -e $dir/export ]; then
-    source $dir/export
-  fi
-
-  if [ -x $dir/bin/release ]; then
-    $dir/bin/release $1 > $1/last_pack_release.out
-  fi
 else
   echo "create-react-app `.buildpacks` not defined. Exiting."
   exit 1

bin/release

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+# Use architecture of multi-buildpack to compose behavior.
+# https://github.com/heroku/heroku-buildpack-multi
 if [ -e $1/last_pack_release.out ]; then
   cat $1/last_pack_release.out
   rm $1/last_pack_release.out