Adds better reusable error message support. Added to fetching remote

posts. /cc @riking

lib/json_error.rb

@@ -0,0 +1,21 @@
+module JsonError
+
+  def create_errors_json(obj)
+
+    # If we're passed a string, assume that is the error message
+    return {errors: [obj]} if obj.is_a?(String)
+
+    # If it looks like an activerecord object, extract its messages
+    return {errors: obj.errors.full_messages } if obj.respond_to?(:errors) && obj.errors.present?
+
+    # default to a generic error
+    JsonError.generic_error
+  end
+
+  private
+
+    def self.generic_error
+      {errors: [I18n.t('js.generic_error')]}
+    end
+
+end