add more information for debugging
#ZATS-3: add cookie test case
#ZATS-3: add cookie setting interface
#ZATS-3: fine-tune comments
#ZATS-3: implement cookies handling mechanism
#ZATS-3: add cookie test case
#ZATS-3: add more comments.
fixed cookie test case issue
#ZATS-8: add batch AU support
Merge branch 'feature.cookies' into feature.au.batch
#ZATS-8: fixed sort operation issue at batch AU posting
#ZATS-8:
 * support concurrent AU posting.
 * fixed issue of AU queues clear.
#ZATS-8:
 * add test case for concurrent AU posting
 * remove unnecessary locking.
refine the exception type.
catch W3C datetime parsing exception and log it
add release note
modify cookie test case according to exception type changed.
Merge branch 'feature.au.batch' into dev
modify release note
#ZATS-9, #ZATS-10: 
  * add interfaces for response handle mechanism
  * add manager of response handlers