best try so far on getRequestTrackingStrategy + InheritableThreadLocal +
caching optimizations.
typeo
changes from labisso
more labisso fixes
backport of labisso's changes for RequestTracking in 2014.08 into
develop.
Merge pull request #202 from unwin/develop+tracking4b

RequestTracking backport from working 2014.08-labisso version