Changes in mega-20180903 (since mega-20180826):

ESPEasy release bot (1):
      automatically updated release notes for mega-20180903

TD-er (7):
      [Pio] Build issues
      [#1692] Add 2nd Receiver for Email notification
      Forgot to save before commit
      [#1549] Add page showing all system variables
      [sysvar] rename vars with leading zero to %..._0%
      [#1688] Add dew point computation as standard conversion
      [Shelly1] Add first test build for Shelly1 nodes