Renamed all .h to .hpp for consistency

tools/str_exception.hpp

@@ -0,0 +1,19 @@
+#ifndef __STR_EXCEPTION_H
+#define __STR_EXCEPTION_H
+
+#include <exception>
+#include <string>
+
+/// A simple exception that takes and holds a string
+class str_exception : public std::exception
+{
+  std::string msg;
+
+ public:
+
+  str_exception(const std::string &m) : msg(m) {}
+  ~str_exception() throw() {}
+  const char* what() const throw() { return msg.c_str(); }
+};
+
+#endif