* Implement runtime version checks in `set_code`
Check that the new runtime code given to `set_code` fullfills some
requirements:
- `spec_name` matches
- `spec_version` does not decreases
- `impl_version` does not decreases
- Either `spec_version` and `impl_version` increase
* Make tests almost work
* Some fixes after master merge
* Fix tests
* Add missed file
* Make depedency check happy?
* Remove leftover `sc-executor`
* AHHHHH
* Reset debug stuff
* Remove some 'static
* More 'static
* Some docs
* Update `Cargo.lock`
Benjamin Kampmann