Merge pull request #389 from jayphelps/leaky-pipes

Fixed memory leak with debounce/throttle arguments and context.

lodash.js

@@ -5697,6 +5697,7 @@
           if (isCalled) {
             lastCalled = now();
             result = func.apply(thisArg, args);
+            args = thisArg = null;
           }
         } else {
           timeoutId = setTimeout(delayed, remaining);
@@ -5711,6 +5712,7 @@
         if (trailing || (maxWait !== wait)) {
           lastCalled = now();
           result = func.apply(thisArg, args);
+          args = thisArg = null;
         }
       };
 
@@ -5733,6 +5735,7 @@
             }
             lastCalled = stamp;
             result = func.apply(thisArg, args);
+            args = thisArg = null;
           }
           else if (!maxTimeoutId) {
             maxTimeoutId = setTimeout(maxDelayed, remaining);
@@ -5743,6 +5746,7 @@
         }
         if (leadingCall) {
           result = func.apply(thisArg, args);
+          args = thisArg = null;
         }
         return result;
       };