ync with latest axiom lib

README.md:
* Nicer command-line for dual axiom + axiom_shell build

boot/amd_loader.js:
* Report on circular deps instead of exploding.

lib/axiom_shell/chrome/background.js:
* Slightly better exception logging.
* Locate the axiom commands service using the full module-service-id.

lib/axiom_shell/descriptor.js
* filesystem/views churn.
* Use full module-service-id's.

lib/axiom_shell/main.js
* Bring in the bind.js code.

lib/axiom_shell/filesystems.js
* Stub filesystem extension.