NanoPlayBoard v0.1.0

• The library is compatible with different versions of NanoPlayBoard (Rev-0.1, Rev-0.2).
• Added support for all the sensors and actuators available on the NanoPlayBoard Rev-0.2.
• Added examples of use for all the sensors and actuators available on the board.
• Minor improvements and refactored code.
• Added third party libraries:
  • Arduino library for the DHT series of low cost temperature/humidity sensors.
  • Software I2C Arduino library.
  • NewPing Arduino library.
• Fixed issue #32.
• Fixed issue #46.
• Fixed issue #47.
• Fixed issue #49.
• Fixed issue #50.
• Fixed issue #54.