Update pipan.php
Update pipan.php

Pi-pan can do much more pan and tilt. The max and min x and y values were updated. The values were brought from the demo-pi-pan.py file itself (which comes with pi-pan).
silvanmelchior/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface