allow calling memory store get() without callback

lib/stores/memory.js

@@ -20,9 +20,14 @@ var memory_store = function (args) {
     };
 
     self.get = function (key, cb) {
-        process.nextTick(function () {
+        var value = lru_cache.get(key);
-            cb(null, lru_cache.get(key));
+        if (cb) {
-        });
+            process.nextTick(function () {
+                cb(null, value);
+            });
+        } else {
+            return value;
+        }
     };
 
     self.del = function (key, cb) {

test/caching.unit.js

@@ -40,13 +40,12 @@ describe("caching", function () {
                     });
                 });
 
-                it("lets us set data without a callback", function (done) {
+                it("lets us set and get data without a callback", function (done) {
                     cache.set(key, value);
                     setTimeout(function () {
-                        cache.get(key, function (err, result) {
+                        var result = cache.get(key);
-                            assert.equal(result, value);
+                        assert.equal(result, value);
-                            done();
+                        done();
-                        });
                     }, 20);
                 });
             });