case-insensitive source search

--HG--
branch : moe
extra : convert_revision : svn%3A2d28d66d-8d94-df11-8c86-00306ef368cb/trunk/moe%40301

app/models/post/sql_methods.rb

@@ -95,7 +95,7 @@ module PostSqlMethods
       end
 
       if q[:source].is_a?(String)
-        conds << "p.source LIKE ? ESCAPE E'\\\\'"
+        conds << "lower(p.source) LIKE lower(?) ESCAPE E'\\\\'"
         cond_params << q[:source]
       end