[CI] Add automatic build

- Add automatic binary generation for windows, linux and darwin
  + Binaries are pushed to http://static.lesterpig.com/dfss (tls will come soon)
  + The build is done ONLY in `master` branch AND on version tags
- Remove the use of "user.HomeDir", because it is not compatible with linux xcompilation

See merge request !28

[c] Add `new` command

- Update platform mockup
- Fix hash bug in platform

See merge request !25

- Update platform mockup
- Fix hash bug in platform
- Fix CLI interactions

[p/contract] Add authentication in postContract



See merge request !27

179 client auth request

Client authentication command.

See merge request !26

178 platform create user

Handle Register and Auth requests
- validity check
- database update
- redudant requests
- gRPC answer messages

See merge request !24

[c] Add show command



See merge request !23

[DFSSC] Add register command to the client



See merge request !22

175 dfssd api

Implement demonstrator API to log any actions.

See merge request !18

180 platform create contract

Missing bits for this MR:

- Authentication checks
- Invitation triggers
- Improved mail tests

This will be fixed in a future MR.

See merge request !21

- Enhance package structure
- Improve platform tests

[mails] Cleanup

- Removed unwanted files
- Put testImg in testdata folder
- Removed existing mail adress and conn info
- Removed filesystem management inside the library
- Fixed critical bug in date header

See merge request !20

- Fix date format
- Remove filesystem management from the library

260 platform mongo



See merge request !19

- Removed unwanted files
- Put testImg in testdata folder
- Removed existing mail adress and conn info

[Platform] Add the ability to start GRPC server

- Updated net library to take pointers and not array of bytes
- Updated dfssp/authority to give public access in PID
- Updated main for better var management

See merge request !17

- Updated net library to take pointers and not array of bytes
- Updated dfssp/authority to give public access in PID
- Updated main for better var management

264 net tests

- Support for non-auth client improved
- Removed fatal in favor of error returns
- Add tests and examples

See merge request !16

[Platform] Add protobuf definitions

Skeleton for the platform's services and messages according gRPC.
See the conception report (mpcs/notes) for double check on the naming conventions.

See merge request !15

Fix ci

- Installed Golang 1.6beta2 on main runners
- Updated docker image
- Updated gometalinter with `interfacer` > fixed mail library warning
- Added update instruction in build to avoid surprises

I'll close it by myself for speed, leaving it here for memory.

See merge request !14

[net] Add the ability to handle non-auth users

- TLS security is not degraded
- Unable to create unit tests

See merge request !13