Add Dominican Republic additional dialing code

Hi,

Dominican Republic has 3 international dial code, +1809 , +1829, +1849 
I just added the 2 dial codes to the country list.

Some more infos on that here:
http://en.chahaoba.com/%2B1829
http://www.alooha.com/travel_dialingcode_Dominican-Republic_do.html
http://www.aa.net.uk/telecoms-callprices-area.html

Pierre