Raw code bug in inverse_kinematics_np Function.

[AzureRossi]

In common/skeleton.py row 58：
'''Get Forward Direction'''
l_hip, r_hip, sdr_r, sdr_l = face_joint_idx

As you said: face_joint_idx should follow the order of right hip, left hip, right shoulder, left shoulder.This mistake may affect the real value of across and subsequent processing.