Allow saving SES to provided data storage

It is not always efficient (or possible) to use standard output
streams. Moreover, such generated result may be now further
processed.

examples/strdiff_storage.cpp

@@ -0,0 +1,38 @@
+#include <dtl/dtl.hpp>
+#include "common.hpp"
+#include <iostream>
+#include <string>
+
+#include "storage.hpp"
+
+using namespace std;
+
+using dtl::Diff;
+
+int main(int argc, char *argv[]){
+    
+    if (isFewArgs(argc)) {
+        cerr << "Too few arguments." << endl;
+        return -1;
+    }
+    
+    typedef char   elem;
+    typedef string sequence;
+
+    sequence A(argv[1]);
+    sequence B(argv[2]);
+    
+    Diff< elem, sequence > d(A, B);
+    d.compose();
+    
+    // Shortest Edit Script
+    cout << "SES" << endl;
+
+    string result;
+
+    d.storeSES < string, CustomStorage > (result);
+
+    cout << result;
+    
+    return 0;
+}