ExtTinker App (RGB-LED control, RX/TX digitalRead/Write)

This version of Tinker App extends the original allowing to control the on-board RGB-LED and the RX/TX pins when they are not used as USART pins.
To work as intended the Spark Core firmware has to be updated to this version https://dl.dropboxusercontent.com/u/60050879/TinkerFW.txt


See preview at https://community.spark.io/t/extended-android-spark-tinker-app-rgb-led-rx-tx-pins/2899