Stub cluster and process methods, moving event method management into before/afterEach.
Add several master event handler test stubs.
Cover master onDrain and onEmpty handlers.
Cover master onMessage handler.
Cover master cluster events.
Test names "should" begin consistently.
Rename 'event handler' suite -> 'Handler'.
DRY-up master Method test class instantiation.
Add pending tests for remaining master API methods.
Cover master getNextFile()
Cover master sendWorkers()
Cover master runQueue()
Cover master startQueue()
Cover master buildFile()
Merge branch 'master' into dependency-filtering