New locale for id-ID (Bahasa Indonesia)

Hi @Serhioromano  - do you mind to take a look for this new locale?
I'm not very sure how to detect and rules for those date. But from what i read on many online resources, islamic calendar using astronomical calculations.

"The Islamic calendar is not to be confused with a lunar calendar that is based on astronomical calculations. The latter is based on a year of 12 months adding up to 354.37 days. Each lunar month begins at the time of the monthly "conjunction", when the Moon is located on a straight line between the Earth and the Sun."

The following url might be very helpful about this information : http://en.wikipedia.org/wiki/Islamic_calendar