add firefoxos platform
add firefoxos platform

ollie314/cordova-mobile-spec,ollie314/cordova-mobile-spec,corimf/cordova-mobile-spec,corimf/cordova-mobile-spec,apache/cordova-mobile-spec,apache/cordova-mobile-spec,apache/cordova-mobile-spec,ollie314/cordova-mobile-spec,corimf/cordova-mobile-spec,apache/cordova-mobile-spec,corimf/cordova-mobile-spec,ollie314/cordova-mobile-spec,corimf/cordova-mobile-spec,ollie314/cordova-mobile-spec,apache/cordova-mobile-spec