new shared crud and schemas and libs

pilab/crud/Cube.py

pilab/crud/Hardware.py

pilab/crud/Host.py

pilab/crud/Image.py

pilab/crud/Key.py

pilab/crud/Pi.py

pilab/crud/Util.py

pilab/crud/__init__.py

pilab/database.py

pilab/events/meta.py

pilab/schemas/Cube.py

pilab/schemas/Hardware.py

pilab/schemas/Host.py

pilab/schemas/Image.py

pilab/schemas/Key.py

pilab/schemas/Pi.py

pilab/schemas/Util.py

pilab/schemas/__init__.py

setup.py