Add "variable" to TemplateSettings.

underscore/underscore-tests.ts

@@ -432,6 +432,7 @@ var template2 = _.template("Hello {{ name }}!");
 template2({ name: "Mustache" });
 _.template("Using 'with': <%= data.answer %>", oldTemplateSettings)({ variable: 'data' });
 
+_.template("Using 'with': <%= data.answer %>", { variable: 'data' })({ answer: 'no' });
 
 _(['test', 'test']).pick(['test2', 'test2']);
 

underscore/underscore.d.ts

@@ -39,6 +39,12 @@ declare module _ {
 		* Default value is '/<%-([\s\S]+?)%>/g'.
 		**/
 		escape?: RegExp;
+		
+		/**
+		* By default, 'template()' places the values from your data in the local scope via the 'with' statement.
+		* However, you can specify a single variable name with this setting.
+		**/
+		variable?: string;
 	}
 
 	interface Collection<T> { }