Env v1.3.2

use hist_v1.3

• resize bg_box area
• add gaussian filter and medium filter to improve response map and color map)

change reward

• reward use precision( if dis(ground_truth, target) > 40px return 0 else return 1 - (dis / 40px))

add file save function

• add file save function in class Env

fix bugs

• fix bugs in show_tracking_result