Modularize test helpers
Add Configuration section to README

Describe configuring `Orbit.Promise` and `Orbit.ajax`.

[Closes #14]
Set `null` as the value for any attributes and links that don't specify a `defaultValue`
Clone `listeners` array so that it can be mutated without affecting `emit` and `poll`
Introduce `one` which automatically removes its listener after the first callback
Introduce `ActionQueue.then` that resolves when the queue is done processing
added test case for sync issue
Consolidate integration tests and ensure they include `find` coverage
Ensure that transforms are settled as part of `find` operations

[Closes #15 and #16]
0.1.4