Instrument the solvers to collect internal stats
Merge branch 'feature/stats' into develop
Configure logging at root project level
Add some logging statements
Extract logic for periodic listener
Add getDefaultFrequency() for subclasses to override
Add a listener to log internal stats
Fix failing tests
Change default log level
Merge branch 'feature/logging' into develop
Bump version to 0.11.1-SNAPSHOT for next release