Release mega-20181130

Changes in mega-20181130 (since mega-20181129):

ESPEasy release bot (1):
      automatically updated release notes for mega-20181130

Gijs Noorlander (4):
      [Readme] Add badge for ReadTheDocs build status
      [Docs] Document ESPeasy p2p controller
      [Docs] Move Sphinx substitutions to separate file to speed-up build
      [Docs] Split Sphinx plugin substitutions to speed-up build

Plebs (12):
      new data structures
      added monitor support
      Added SafeButton feature
      fixing Safebutton
      added P019 PCF support
      Fixed write function in PCF8574
      Added support for P011, P022, P059, P063
      Update _P009_MCP.ino
      fixed pcf8574 to avoid #702
      bugfixing
      more bugfixing
      final cleanup