That way, changes can be tracked.
Also, we make it official.
Future checkins will only be made if major changes were done,
similar to how the APIs are handled.
Related to #64
This allows us to build efficiently. CLI programs can now have their
own cmn.rs implementation, which we can test standalone with
`cargo test`.
The primary makefile currently just explicitly pulls in the type-*.yaml,
one day we could possibly put it into a loop.
Fixes#11
