Merge pull request #40 from hintjens/master

Finished fixes for MSVC
Merge pull request #41 from hintjens/master

Minor change to naming
Merge pull request #42 from hintjens/master

Refactored FileMQ to use CZMQ 2.1.0 and ZMTP security
Send file deletion notification to client - makes protocol symmetric
Merge pull request #48 from asgibbons/master

Send file deletion notification to client - makes protocol symmetric