RethinkDB native connector work, minor fixes.

ext/librethinkdbxx/src/exceptions.h

@@ -0,0 +1,13 @@
+#ifndef EXCEPTIONS_H
+#define EXCEPTIONS_H
+
+namespace RethinkDB {
+
+class TimeoutException : public std::exception {
+public:
+    const char *what() const throw () { return "operation timed out"; }
+};
+
+}
+
+#endif  // EXCEPTIONS_H