add tinyxml, urdfdom and urdfdom_headers from https://github.com/ros/urdfdom

(removed BOOST dependency and make it compile on Windows)

btgui/urdf/boost_replacement/lexical_cast.h

@@ -0,0 +1,27 @@
+#ifndef BOOST_REPLACEMENT_LEXICAL_CAST_H
+#define BOOST_REPLACEMENT_LEXICAL_CAST_H
+
+#include <stdlib.h>
+
+namespace boost
+{
+
+	template <typename T> T lexical_cast(const char* txt)
+	{
+		double result = atof(txt);
+		return result;
+	};
+
+	struct bad_lexical_cast
+	{
+		const char* what()
+		{
+		return ("bad lexical cast\n");
+		}
+		
+	};
+	
+} //namespace boost
+
+#endif
+