Release mega-20180903
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