Merge pull request #54 from jtrmal/gcc_44_fixes

Fixing GCC 4.4  -std=gnu++0x compilation issues

src/nnet2bin/nnet-shuffle-egs.cc

@@ -75,7 +75,8 @@ int main(int argc, char *argv[]) {
       std::random_shuffle(egs.begin(), egs.end());
     } else {
       KALDI_ASSERT(buffer_size > 0);
-      egs.resize(buffer_size, std::pair<std::string, NnetExample*>("", NULL));
+      egs.resize(buffer_size, 
+          std::pair<std::string, NnetExample*>("", static_cast<NnetExample *>(NULL)));
       for (; !example_reader.Done(); example_reader.Next()) {
         int32 index = RandInt(0, buffer_size - 1);
         if (egs[index].second == NULL) {