Add some TODO comments

app/models/snapshot_fragment.rb

@@ -1,4 +1,4 @@
-class SnapshotFragment
+class SnapshotFragment # TODO: rename to Cell or SnapshotCell
 
   attr_reader :text, :brush
 

spec/models/asciicast_spec.rb

@@ -23,6 +23,7 @@ describe Asciicast do
     end
   end
 
+  # TODO: create a service for this
   describe '#save' do
     let(:asciicast) { FactoryGirl.build(:asciicast, :user => user) }