Create a test harness for database service adapters

[ekryski]

We want all the database service adapters to support the same functionality and no one likes writing tests. It's also a huge pain in the ass to keep multiple test suites that are nearly identical up to date across all adapters.

Therefore, we need one unified test harness that we can require as a module and get our service adapters to test against.

[ekryski]

Working is being done here: https://github.com/feathersjs/feathers-service-tests

[ekryski]

A first cut is now up an we have feathers-nedb and feathers-knex passing with the test harness. 💥

[lock]

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