0.8.0-rc.11 hard fault on wifi reconnect unstable network (p1)

@Div_IoT, in 0.7.0, WiFi.RSSI() will cause a hard fault with a unstable wifi network. It should be easily reproduce with a simple test case. I did that before if you call RSSI with out Wifi.Ready and Particle.connected this will happen. Even system event will not catch this error. To mini this happen, check Wifi.ready and Particle.connected, that what I used. It prevent it from happen 99% time. That why, I was moving to 0.8.0-rc.11. Below have more information on 0.7.0. I hope this help, this is in SEMI_AUTOMATIC mode.