0.12.0

• Add ArduinoSTL, a STL and iostream implementation for Arduino based on uClibc++
• Update firmware for node-wifi-mqtt (node-wifi-mqtt.ino). Thanks Clemens and Karsten!
  • Make things actually work
  • Add dependency "Adafruit_MQTT_Library"
  • Add more sensors
  • Add Makefile and documentation
• Improve Homie Firmware for node-wifi-mqtt-homie
  • Add dependencies as git submodules
  • Add Makefile
• Add Terkin C++ library: Flexible data collection for decoupling sensor reading and telemetry domains