Added small 'read' program to test reading a single doc (from stdin)

util/CMakeLists.txt

 add_executable(sandbox sandbox.cpp)
 target_link_libraries(sandbox yaml-cpp)
+
+add_executable(read read.cpp)
+target_link_libraries(read yaml-cpp)

util/read.cpp

+#include "yaml-cpp/yaml.h"
+#include "yaml-cpp/eventhandler.h"
+#include <iostream>
+
+class NullEventHandler: public YAML::EventHandler
+{
+public:
+    typedef YAML::Mark Mark;
+    typedef YAML::anchor_t anchor_t;
+    
+    NullEventHandler() {}
+    
+    virtual void OnDocumentStart(const Mark&) {}
+    virtual void OnDocumentEnd() {}
+    virtual void OnNull(const Mark&, anchor_t) {}
+    virtual void OnAlias(const Mark&, anchor_t) {}
+    virtual void OnScalar(const Mark&, const std::string&, anchor_t, const std::string&) {}
+    virtual void OnSequenceStart(const Mark&, const std::string&, anchor_t) {}
+    virtual void OnSequenceEnd() {}
+    virtual void OnMapStart(const Mark&, const std::string&, anchor_t) {}
+    virtual void OnMapEnd() {}
+};
+
+int main()
+{
+    YAML::Parser parser(std::cin);
+    NullEventHandler handler;
+    parser.HandleNextDocument(handler);
+    return 0;
+}