Search Refactor: Let's use a class to keep track of our state rather

than passing params everywhere. Also make the private API private.

app/controllers/search_controller.rb

@@ -3,8 +3,11 @@ require_dependency 'search'
 class SearchController < ApplicationController
 
   def query
-    search_result = Search.query(params[:term], guardian, params[:type_filter], SiteSetting.min_search_term_length)
-    render_json_dump(search_result.as_json)
+    search = Search.new(params[:term],
+                        guardian: guardian,
+                        type_filter: params[:type_filter])
+
+    render_json_dump(search.execute.as_json)
   end
 
 end