acu169058 - Remove unneeded long-polling failure logging
acu169058 - Change to use router instead of mapper
acu169058 - Make compatible with ruby 2.1.2
acu169058 - Derive exceptions from StandardError or RuntimeError instead of Exception
acu169058 - Create and apply ErrorTracker for tracking unexpected exceptions
acu169058 - Bump version to 2.3.0