- rewrote the "contextSelector.html" chapter. The chapter was renamed as "loggingSeparation.html"

- logback now uses slf4j version 1.5.6
- ContextJNDISelector was refactored. The config file name for a new logger context is based on convention "logback-CONTEXTNAME.xml" 
  This obviates the need to set the "logback/configuration-resource" JNDI env-entry.