Instead of using spoiler boolean and spoiler_text, simply check for non-blank spoiler_text

Federate spoiler_text using warning attribute on <content /> instead of a <category term="spoiler" />
Clean up schema file from accidental development migrations

app/views/api/v1/statuses/_show.rabl

@@ -1,4 +1,4 @@
-attributes :id, :created_at, :in_reply_to_id, :sensitive, :spoiler, :visibility
+attributes :id, :created_at, :in_reply_to_id, :sensitive, :spoiler_text, :visibility
 
 node(:uri)              { |status| TagManager.instance.uri_for(status) }
 node(:content)          { |status| Formatter.instance.format(status) }