fix pom for security manager example
minor eclipse warnings removal
Working on Struts security manager setup for PWR + Struts2 example.

Still working on a bug for request invalidation
-Fix issue where session was automatically created even if stateless was set to true.
-Fixed potential memory leak on filter chain exception.
Fix caching problem in struts 2 app.
Tweaking with security manager.
-Remove no longer used methods for PicoServletContainerListener.java
-Eliminate edge-case race condition in threadlocal storage.
Clear up race conditions in In mrmory Cheese dao
Change collections to typeseafe ones.
Fix race condition for initialization.
clean imports
Make inmemory dao threadsafe.
minor code cleanup.