Get a list of profile pictures for a user
getUserProfilePhotos(user_id = NULL, offset = NULL, limit = NULL,
destfile = NULL)
Unique identifier of the target user (required)
Sequential number of the first photo to be returned. By default, all photos are returned
Limits the number of photos to be retrieved. Values between 1-100 are accepted. Defaults to 100
if a path is specified save the image (by default the bigger) in a local file