Make `unsatisfy-all-dependencies` idempotent...

This is used in `shutdown-server` and was causing boot to fail if
shutdown-server (and `unsatisfy-all-dependencies`) had been called more
than once because the second call wiped out all of the todo's.
Added test-helpers and updated overtone.smoke-test...

* Added `with-internal-server` test fixture
* Added `with-server-sync` test fixture
* Added `withsync-reset` test fixture
* Improved `eval-in-temp-ns` helper + tests
Fix a couple of typos
Run examples in overtone.smoke-test
Fixed ns for internal-sequencer example
Added polynome lib as a test dependency to run polynome example
Remove extraneous args to pink-noise in monomestep example