Test stubs for Logger
Implement Logger
Add Logger to InteractionMachine
Add Logger to docs
Fix indentation for Logger's docstrings
Use log.error instead of log.info in InteractionMachine in 'error' places
Use log.error instead of log.info in App in 'error' places
Add log modules to main index
Merge branch 'develop' into feature/issue-120-add-a-log-helper
Fix docstring for Logger.error (s/CRITICAL/ERROR)
Fix bad test description for Logger.info
Fix bad test for Logger.critical (was using Logger.error instead, copy-paste error)
Merge branch 'feature/issue-120-add-a-log-helper' into develop