Warn folks to check they're in the right Gemfile.

Author: nuclearsandwich

sites/curriculum/deploying_to_heroku.step

@@ -14,6 +14,8 @@ situation "First-time setup" do
   end
 
   step "Edit the Gemfile" do
+    important "Each application has its own `Gemfile`. Be sure you're opening the one inside your app's folder."
+
     message "Heroku will run our application slightly differently than our development computer does, which requires us to make a small change to our `Gemfile`."
 
     message "Open the file called `Gemfile` in Sublime Text, or your preferred editor, and find the line containing:"

sites/installfest/get_a_sticker.step

@@ -184,6 +184,7 @@ nothing to commit (working directory clean)"
 end
 
 verify "heroku deploy" do
+  important "Each application has its own `Gemfile`. Be sure you're opening the one inside your sticker app's folder."
 
   message "Use your editor to open the Gemfile and find the line containing:"