Add tasks for all the new languages

Task/Factorial/Ursa/factorial-1.ursa

@@ -0,0 +1,9 @@
+def factorial (int n)
+	decl int result
+	set result 1
+	decl int i
+	for (set i 1) (< i (+ n 1)) (inc i)
+		set result (* result i)
+	end
+	return result
+end

Task/Factorial/Ursa/factorial-2.ursa

@@ -0,0 +1,8 @@
+def factorial (int n)
+      decl int z
+      set z 1
+      if (> n 1)
+              set z (* n (factorial (- n 1)))
+      end if
+      return z
+end