fix whitespace at the end of the line; add newline at the end of the spec file
use extract block refactoring in the spec file_spec
Adding cluster simulator for better testing.
Merge pull request #419 from mongodb/cluster-simulator

All hail our testing saviour - the cluster simulator.
Add all server description fields
Merge pull request #424 from mongodb/full-description-fields

Add all server description fields
Modeling operations