style: Enable rustfmt merge_imports and format
This commit enables the rustfmt merge_imports setting
and formats the whole code base accordingly.
Note that the setting is not stable yet, but will be with Rust 1.38.
In the meantime, running fmt on stable will just leave the
changes alone so no problems should occur.
* Added juniper_iron crate
* Fixed up juniper_rocket crate
* Updated juniper/Cargo.toml
* Updated docs (readme, module docs)
* Export http integrator tests with export-test-schema feature
* Update CI tests (Use cargo-make )
* Format parts of the code base
