Merge branch 'master' into tessel_to_mqtt

* master: (32 commits)
  Fixed wrong counter
  added Service
  added phonegap example (only works in a network where each one can see each other and internet available), listening on a rest service for sensor messages
  ip
  changes in main
  pre push
  Fixed Listener
  separated concerns of collecting data and listening to data
  added json libraries for arduino
  Added Listener
  added urls for libraries
  adjusted light range
  pre Merge
  Added entry listener:
  fixed some positioning errors
  changed second servo to listen to light channel
  simple websocket
  added
  push test
  Node.js Message Forwarder
  ...
updates for iOS client
ka
Merge branch 'master' into tessel_to_mqtt

* master:
  ka
  added tilt channel
  removed submodule
  added a spring boot example with twitter service (tweeting the posted payload)
  Used locks to ensure only one twitter service is active
  Some minor fixes to ntp example.
  tweeting at most every 5 minutes about the temperature
  Funktionierendes Ntp für Arduino mit Sommerzeit
  Implemented Twitter service

Conflicts:
	iOS/Tessel2Go/Tessel2Go.xcworkspace/xcuserdata/bboron.xcuserdatad/UserInterfaceState.xcuserstate
	iOS/Tessel2Go/Tessel2Go.xcworkspace/xcuserdata/bboron.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
Merge branch 'tessel_to_mqtt'

* tessel_to_mqtt:
  updates for iOS client