move DISABLE_INJECTION to lower level

bin/compile

@@ -183,7 +183,7 @@ pip install --use-mirrors -r requirements.txt --src ./.heroku/src | indent
 #
 # See [`bin/steps/django`](django.html).
 
-if [ "$NAME" = "Python/Django" ] && ! [ "$DISABLE_INJECTION" ]; then
+if [ "$NAME" = "Python/Django" ]; then
   source $BIN_DIR/steps/django/init
 fi
 

bin/steps/django/init

@@ -11,5 +11,8 @@ PROJECT=$(dirname $SETTINGS_FILE)
 
 export SETTINGS_FILE PROJECT
 
-source injection
+if [ "$DISABLE_INJECTION" ]; then
+    source injection
+fi
+
 source collectstatic

bin/steps/django/injection

@@ -12,12 +12,6 @@
 # ## Sanity Checks
 #
 
-# Reject a Django app that appears to be packaged incorrectly.
-if [ -f settings.py ]; then
-  echo " !     Django app must be in a package subdirectory"
-  exit 1
-fi
-
 echo "-----> Installing dj-database-url..."
 pip install --use-mirrors dj-database-url | indent