CalendarConversions: now with the Jalali calendar

I fear we have lost @ehsan as a direct contributor, but I would still like his code to make it in to production.  In particular, this calendar conversions work should be on the site.

@mintsoft The date_output_format doesn't work so well here because the month names (I expect) are different.  How do you feel about this ISO-8601 (with time elided) version?


![screenshot from 2014-09-25 17 58 17](https://cloud.githubusercontent.com/assets/6280000/4413100/2df59328-4500-11e4-86fb-b6d970726b40.png)

Should it be `Jumada al-thani` and `Jumada al-awwal`? Not sure, but saw a different spelling in https://en.wikipedia.org/wiki/Islamic_calendar#History