Initial work on unifying the blocking and non-blocking handlers
set the isInIoThread flag
Remove blocking handlers
Fix up some threading problems with async servlet
Big servlet refactor
Remove worker dispatcher
Just use a predicate handler for servlet security
Fix pipelining performance problem
Minor refactoring
Use list instead of set for notifications
Lazily allocate servlet request attributes map
Don't add security constraint handlers if there are no constraints
Fix bug in servlet form auth