Release v2.0-20180122

Changes in v2.0-20180122 (since v2.0-20180121):

ESPEasy release bot (1):
      automaticly updated release notes for v2.0-20180122

Gijs Noorlander (2):
      [issue #745] Set IPaddress to 0.0.0.0 when read from empty string (#754)
      [#732] Only process P029 MQTT helper when enabled (#743)