Add verifier that checks .arcconfig for phabricator.uri
Load configuration from .travicator.yml files
Add version command
Make help command actually work
Add (empty) verify command
Add topological sortable hash
Fix up verifiers deps for verify command
Add descriptions to verifiers
Add default (empty) options to verifier base
Make prepush verifier compile
Check for nonexistent .travicator.yml
Display the right error message when phabricator.uri is not found in .arcconfig
Functional verify command
Make php class error look better