Added matchers: truthy, falsy, empty and notEmpty

src/core/asymmetric_equality/Falsy.js

@@ -0,0 +1,18 @@
+getJasmineRequireObj().Falsy = function(j$) {
+
+    function Falsy() {}
+
+    Falsy.prototype.asymmetricMatch = function(other) {
+        if (!other) {
+            return true;
+        }
+
+        return false;
+    };
+
+    Falsy.prototype.jasmineToString = function() {
+        return '<jasmine.falsy>';
+    };
+
+    return Falsy;
+};