Webpage-related fixes (#1420)

* Fix webpage-generator script
   - Generate 'site.github.url' instead of 'site.baseurl' (#1248)
   - Include 'Reference counting' documentation
 * Remove trailing whitespaces from 05.PORT-API.md

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

docs/05.PORT-API.md

@@ -68,13 +68,13 @@ 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, ...);