PEP8 fix
Merge branch 'master' of github.com:corso-python-prato/share-system-team2

Conflicts:
	client/client_daemon.py
Fixed some bug in the last merge and replaced pickle with json to save local_dir_state
Minor comment fix
Rewrited event handler(yes another time...) to clarify what happen during event and implemented the first management of response by connection manager
Changed name of md5_exists in search_md5 (more near of what this method do) and now the method return None in case of no match (before call stop method! not really what we need)
Merge branch 'master' of github.com:corso-python-prato/share-system-team2