added tests for HTML tags, bugs in HTML tags fixed

Source/DoxygenTranslator/src/DoxygenParser.h

@@ -140,6 +140,12 @@ private:
    */
   std::string trim(const std::string &text);
 
+  /*
+   * Returns string of the next token if the next token is PLAINSTRING. Returns
+   * empty string otherwise.
+   */
+  std::string getNextToken();
+
   /*
    * Returns the next word ON THE CURRENT LINE ONLY
    * if a new line is encountered, returns a blank std::string.