Refactor api : all bma package refactored

duniterpy/api/bma/api.py

duniterpy/api/bma/blockchain.py

duniterpy/api/bma/network.py

duniterpy/api/bma/network/__init__.py

duniterpy/api/bma/node.py

duniterpy/api/bma/tx.py

duniterpy/api/bma/tx/__init__.py

duniterpy/api/bma/tx/history.py

duniterpy/api/bma/ud.py

duniterpy/api/bma/wot.py

duniterpy/api/bma/ws.py

duniterpy/documents/__init__.py

duniterpy/documents/block.py

duniterpy/documents/certification.py

duniterpy/documents/peer.py

examples/create_and_publish_identity.py

examples/request_data.py

examples/save_revoke_document.py

examples/send_certification.py

examples/send_membership.py