Merge pull request #48 from asgibbons/master

Send file deletion notification to client - makes protocol symmetric
Updated to use zproto instead of own codec_c

- also modified RFC 35 to match new zproto encoding for dictionaries
Merge pull request #45 from hintjens/master

Fixed usage of CZMQ zstr_sendf/sendfm
Merge https://github.com/zeromq/filemq