removed ThreadPoolFactoryBean and related classes
added MockExecutorService to support unit tests
removed ThreadPoolFactoryBean from nested component rules
ServerSocketAppenderBase now uses context executor service
receivers now use context executorService
removed references to thread pool configuration
don't stop executorService in ReceiverBase
reworked SocketReceiverTest to use context executor service
no need to use slf4j in ServerSocketReceiverFunctionalTest
Merge branch 'useContextExecutorService2'
Merge branch 'master' of github.com:qos-ch/logback