Fix core so that HMAC-SHA224/384 work correctly

The 256/512 variants already were correct, but the 224/384 did not
and gave differing values when compared to Python's hmac library.

The bug appears to have be detected on 2013-03-17 according to a post
titled:

Issue 84: HmacSHA224 and HmacSHA384 give incorrect output

https://code.google.com/p/crypto-js/issues/detail?id=84

Signed-off-by: Christopher Hall <hsw@ms2.hinet.net>

src/core.js

@@ -210,14 +210,11 @@ var CryptoJS = CryptoJS || (function (Math, undefined) {
                     var thatByte = (thatWords[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                     thisWords[(thisSigBytes + i) >>> 2] |= thatByte << (24 - ((thisSigBytes + i) % 4) * 8);
                 }
-            } else if (thatWords.length > 0xffff) {
+            } else {
                 // Copy one word at a time
                 for (var i = 0; i < thatSigBytes; i += 4) {
                     thisWords[(thisSigBytes + i) >>> 2] = thatWords[i >>> 2];
                 }
-            } else {
-                // Copy all words at once
-                thisWords.push.apply(thisWords, thatWords);
             }
             this.sigBytes += thatSigBytes;