JOHNSON-12 Add a mechanism for doing split startup with Spring

Created LifecycleDispatcherServlet and associated classes for filters and servlets

Created LifecycleUtils and LifecycleState for tracking basic states that the LifecycleDispatcherServlet goes through

• Ultimately this may need to turn into something extensible, where LifecycleState becomes an interface with a StandardLifecycleState enumeration that implements it and defines the existing four states

Added EventExceptionTranslator, an SPI interface allowing applications to provide pluggable translation for exceptions to produce their own well-defined Johnson events

Updated JohnsonContextLoaderListener and JohnsonDispatcherServlet to receive EventExceptionTranslators via context parameters and apply them when they're present

Added some missing documentation/annotations in Johnson