add toastr for notifications

app/helpers/application_helper.rb

@@ -148,6 +148,17 @@ module ApplicationHelper
     end
   end
 
+  def toast_bootstrap_flash
+    flash_messages = []
+    flash.each do |type, message|
+      type = 'success' if type == 'notice'
+      type = 'error'   if type == 'alert'
+      text = "<script>toastr.#{type}('#{message}');</script>"
+      flash_messages << text.html_safe if message
+    end
+    flash_messages.join("\n").html_safe
+  end
+
   def label_for(event_state)
     result = ''
     case event_state