Fix quoting issue on generate sql statements

Using the previous method to generate the quote string could lead to incorrect
sql statement where double quotes were used for select statements in MySql.

By using the `quote_table_name` function from Rails, the correct quoting
mechnism will be automatically used for the specific database.

Fixes cerebris#1369

lib/jsonapi/active_relation_resource.rb

@@ -845,7 +845,7 @@ def alias_table_field(table, field, quoted = false)
       end
 
       def quote(field)
-        "\"#{field.to_s}\""
+        ActiveRecord::Base.connection.quote_table_name(field)
       end
 
       def apply_filters(records, filters, options = {})