Release v2.0-20180118

Changes in v2.0-20180118 (since v2.0-20180116):

ESPEasy release bot (1):
      automaticly updated release notes for v2.0-20180118

Edwin Eefting (1):
      refactoring test suite controller stuff

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