Better test organization

[lance]

I think the example project should have two sets of tests that run, unit tests and functional tests. For example:

/test/unit/test-a.js
/test/unit/test-b.js

and

/test/functional/test-a.js
/test/functional/test-b.js

The existing test-ci.js could move to /test/functional/run-tests.js. The test script in package.json could simply be tape test/unit/*.js and a new script could be added to either the Makefile or package.json to run the functional tests.

By default, when this repo is cloned and a user runs npm test probably it should just be the unit tests that are run, with perhaps some console output saying something like "Execute make ci to run functional tests.".

Add a ci target to the Makefile which runs both unit and functional tests, and have .travis.yml use make ci for the script property.

WDYT?

[helio-frota]

done.