4.0.7 20170319
* Increased Sonoff Led PWM frequency from 432 to 1000
* Fix possible watch dog reboot after changing module type on web page
* Fix reporting of GPIO usage from web page
* Fix Sonoff Led blank during firmware upgrade
* Fix Sonoff Led flicker and possible flash corruption by using latest
Arduino-esp8266 versions
* of pwm core files included in sonoff library (#211)
* Add PWM output control with commands PWM1 to PWM5 using user
selectable GPIOs (#211)
* Fix exceptions due to low values of commands HlwPCal (10000), HlwUCal
(1000) and HlwICal (2500) (#223)
* Add Switch state to sensor status (#227, #233)
* Add user configuarble GPIO to module Sonoff Touch (#228)
* Add define WEB_PORT to user_config.h to change default web server port
from 80 (#232)
* Fix failed Ota Firmware upgrade started from Web page (#235)
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