[fix] #98 fix tests folder included and installed with duniterpy package

Makefile

duniterpy/tests/__init__.py

duniterpy/tests/api/__init__.py

duniterpy/tests/api/bma/__init__.py

duniterpy/tests/api/bma/test_blockchain.py

duniterpy/tests/api/bma/test_bma.py

duniterpy/tests/api/bma/test_network.py

duniterpy/tests/api/bma/test_tx.py

duniterpy/tests/api/bma/test_wot.py

duniterpy/tests/api/bma/test_ws.py

duniterpy/tests/api/webserver.py

duniterpy/tests/documents/__init__.py

duniterpy/tests/documents/test_block.py

duniterpy/tests/documents/test_certification.py

duniterpy/tests/documents/test_crc_pubkey.py

duniterpy/tests/documents/test_membership.py

duniterpy/tests/documents/test_peer.py

duniterpy/tests/documents/test_transaction.py

duniterpy/tests/documents/test_ws2p_heads.py

duniterpy/tests/grammars/__init__.py