modify jsoncpp because we aren't using stdc++11

Author: roballie

src/lib_json/json_writer.cpp

@@ -15,6 +15,7 @@
 #include <math.h>
 #include <stdio.h>
 #include <string.h>
+#include <boost/shared_ptr.hpp>
 
 #if defined(_MSC_VER) && _MSC_VER < 1500 // VC++ 8.0 and below
 #include <float.h>
@@ -1017,14 +1018,14 @@ StreamWriter* OldCompressingStreamWriterBuilder::newStreamWriter(
 
 std::string writeString(Value const& root, StreamWriter::Factory const& builder) {
   std::ostringstream sout;
-  std::unique_ptr<StreamWriter> const sw(builder.newStreamWriter(&sout));
+  boost::shared_ptr<StreamWriter> const sw(builder.newStreamWriter(&sout));
   sw->write(root);
   return sout.str();
 }
 
 std::ostream& operator<<(std::ostream& sout, Value const& root) {
   StreamWriterBuilder builder;
-  std::shared_ptr<StreamWriter> writer(builder.newStreamWriter(&sout));
+  boost::shared_ptr<StreamWriter> writer(builder.newStreamWriter(&sout));
   writer->write(root);
   return sout;
 }