added _.unescape definition

lodash/lodash-tests.ts

@@ -769,6 +769,9 @@ result = <any[]>_.times(3, _.partial(_.random, 1, 6));
 result = <any[]>_.times(3, function(n: number) { mage.castSpell(n); });
 result = <any[]>_.times(3, function(n: number) { this.cast(n); }, mage);
 
+result = <string>_.unescape('Moe, Larry &amp; Curly');
+
+
 //////////////////////////////////////////////////////////////////////////////////////////////////
 
 var iceCream = { flavor: "chocolate" };

lodash/lodash.d.ts

@@ -2837,7 +2837,14 @@ declare module _ {
 		callback: Function, 
 		context?: any): TResult[];
 
-	
+	/**
+	* The inverse of _.escape this method converts the HTML entities &amp;, <, &gt;, &quot;, and 
+	* &#39; in string to their corresponding characters.
+	* @param string The string to unescape.
+	* @return The unescaped string.
+	**/
+	export function unescape(
+		string: string): string;