README: refer to conceptql-dev-box in contributing
CLI: fix wording, remove some commands

Some commands aren't applicable to most users, so I'm hiding them.
CHANGELOG: update for 0.0.2
Version: bump to 0.0.2
Spec: add section on handling CDMv5 fact_relationship
Tree: deep symbolize keys in a statement
GraphNodifier: add more fake types
GraphNodifier::BinaryOperatorNode: add #displayable_options
GraphNodifier: make #create easier to debug
FakeGrapher: makes it easier to create fake graphs
CHANGELOG: update for 0.0.3
Version: bump to 0.0.3