Add a todo in client
Merge branch image-server into dev
Rename ImageServer module to image-server and removed some unused files
Remove some unused files and update readme
First workable version with user server, web server and image server and same test sample code

Workable user server
A simple web server
Image server with heartbeat and JPA
C++/Python client sample code (in netty-protobuf-test)
Unfinished image processor with EXIF reader
Merge branch 'dev' into image-server