Updating the script to match the latest URL format and accept the argume...

...nts for width and height

The latest URL format is:
https://lh5.googleusercontent.com/-rQ9SZ0dfJ_I/UtTzyqBufcI/AAAAAAAAOj4/zAOnrvu9aG8/s1280-w1280-c-h720/Silver%2BLake%2BStarTrails.jpg