added files for Chapter Nine : Using the Session
added files for Chapter 10 : Design Consideratins with Hibernate 3
updated configuration file for Chapter 10
added files for Chapter 11 : Events and Interceptors
updated configuration file for Chapter 11
added files for Chapter 12 : Hibernate Filters
updated configuration file for Chapter 12
added files for Chapter 13 : Fitting Hibernate into the Existing Environment
updated configuration file for Chapter 13