Adding language presence by territory to langdb

A very simple mechanism for importing per-country language lists
from CLDR to ULS' langdb.

If I understand correctly, we only need languages spoken in a country
ordered by number of speakers. The CLDR data already has it and it should be
mostly useful.

Also added a utility function and a test.

Some tweaks to override the CLDR data are still needed:

* The data as it is omits some useful languages. For example, Amharic is not
  listed in Eritrea.
* Some countries have a very large number of languages. Ideally it's right,
  but is not practical currently, for example India with 75. Maybe
  hand-picking or limiting the choice to top X languages can be useful,
  but requires thought.
* Some language codes are standard, but different from Wikipedia practice,
  for example "pa_Guru" (we just write "pa"). Maybe a mapping of codes
  is needed.

Change-Id: I3c0cd5a9118997ba39a4f3695978e359f3de6956

src/jquery.uls.data.utils.js

@@ -338,4 +338,13 @@
 	$.uls.data.isRtl = function( language ) {
 		return $.inArray( $.uls.data.script( language ), $.uls.data.rtlscripts ) !== -1;
 	};
+
+	/**
+	 * Returns the languages spoken in a territory.
+	 * @param string Territory code
+	 * @return list of language codes
+	 */
+	$.uls.data.languagesInTerritory = function( territory ) {
+		return $.uls.data.territories[territory];
+	};
 } )( jQuery );