Update the webpage (#1421)

* Re-generate the files with `tools/update-webpage.sh`
 * Add the document about reference counting
 * Introduce a drop down list for documents

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

05.PORT-API.md

@@ -77,13 +77,13 @@ typedef enum
  * of the parameter list.
  *
  * This function is only called with messages coming from the jerry engine as
- * the result of some abnormal operation or describing its internal operations 
+ * the result of some abnormal operation or describing its internal operations
  * (e.g., data structure dumps or tracing info).
  *
  * It should be the port that decides whether error and debug messages are logged to
  * the console, or saved to a database or to a file.
- * 
- * Example: a libc-based port may implement this with vfprintf(stderr) or 
+ *
+ * Example: a libc-based port may implement this with vfprintf(stderr) or
  * vfprintf(logfile), or both, depending on log level.
  */
 void jerry_port_log (jerry_log_level_t level, const char *fmt, ...);