Release mega-20180118

Changes in mega-20180118 (since mega-20180117):

ESPEasy release bot (2):
      automaticly updated release notes for v2.0-20180116
      automaticly updated release notes for mega-20180118

Edwin Eefting (3):
      made test resumable and importable
      now supports powercycle to test for bugs like #719
      added fixme

Gijs Noorlander (2):
      [issue 733] Fix for negative values on MQTT import (#735)
      [issue 728] Proper reconnect for MQTT controllers (#737)