build_system:
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* Configured the build system (CMake >= 2.8).
* Added Arduino's core lib (files). Lib will be created and linked to the project.
* Updated the README with build instructions and some helpful notes.
* Added the main.cc file containing a simple test. It prints 'Hehe' to the Arduino's serial port.
* Added a shell script which can be used to upload a new build to the arduino. This script is called upload_to_arduino.sh
* The CMake compiler settings are placed in arduino_compile_set.cmake
Merge branch 'build_system' into dev