Signed-off-by: kafeier <791961143@qq.com>
rocket change,add impulse

Signed-off-by: kafeier <791961143@qq.com>
Merge branch 'develop' of https://github.com/pandamicro/Magnetic-Force.git into develop

Conflicts:
	Magnetic/src/GlobalValue.js

Signed-off-by: kafeier <791961143@qq.com>
添加了one button，现在只有z，m两个按键，其中按下时有冲量，之后就是有一个持续的力。
PLAYER_PARTICLE_RESET_POS_INTERVAL = 0.5,
    ROCKET_FORCE_TIME = 0.5,//rocket contine time
    ROCKET_FORCE_TIME_RATE = 1,//the rocket force will decrese with time,that is ratio of time effect the force
    ROCKET_IMPULSE = 200,//when rocket open,it will have a impilse,it will make have a jump,and then will have a force continue
    ROCKET_FORCE = 300;
这几个在GlobalValue.js中的变量时控制按下时力和冲量的
Signed-off-by: kafeier <791961143@qq.com>