* Use multi step build to limit the image size
This change replace the Dockerfile with a multi step build to avoid huge image
size (the new image should be around 130Mo including all layers), compared to
more that 1Go with the full build chain. It's also more safe. This image does
not include cargo (not needed in production), so the old Dockerfile is available
and renamed Dockerfile.slim for those who use Docker for development setup.
* Use correct path for local repository
* Use sleep between chmod and execution
* Update plume-front build to use a shell script that adds the necessary dependencies on arm (x86 left untouched inside the script)
* Fix cleanup portion of plume-front.sh
* Break wasm dependencies for arm out so they are run before the main builds to improve layer caching on subsequent docker builds
* Fixup dockerfile so wasm-deps can run properly and with fewer assumptions
* Move new scripts to script/ folder
* Remove saving of path as it's not actually not necessary
* Add rust-toolchain to early copy so it pulls the right rust release (addresses #400)
Rust can compile to WASM, so let's use it for front-end code as well.
To compile the front-end:
```
cargo install cargo-web
cargo web deploy -p plume-front
```
* Remove use of String for body parameters
Create SignedJson and implement FromData for it
* Make Travis test on release
* Remove warning when installing and fix coverage
Dominique Feyer
KemoNine
Baptiste Gelez
fdb-hiroshima
Eliot Berriot