Sort feed items, moment.locale() instead of moment.lang()

[mplattu]

Sort items by publish date or title in ascending/descending order

• Needed the sort feature in my own project
• Noticed that YQL supports sorting (https://developer.yahoo.com/yql/guide/select.html, see functions)

Use moment.locale() instead of moment.lang(), which is deprecate

• moment complains to the browser log that moment.lang() is deprecated and should be replaced by moment.locale()