add ep2015 program grid ipynb
add ep2015 program grid ipynb

EuroPython/ep-tools,PythonSanSebastian/ep-tools,EuroPython/ep-tools,EuroPython/ep-tools,PythonSanSebastian/ep-tools,PythonSanSebastian/ep-tools,EuroPython/ep-tools,PythonSanSebastian/ep-tools