WELD-942: corrected/removed high priority warnings
WELD-1592 Update "Servlet containers" chapter
- revert  WELD-1567
- add info about EnhancedListener
WELD-1595 Improve interceptor chain invocation throughput
- fix AccessController performance problem (inspired by Stuart's commit)
- remote useless toString() invocation on log method
WELD-1595 Minor improvements of
CombinedInterceptorAndDecoratorStackMethodHandler