fixed #244
prepare for 1.9.8
updated gemspec
added uwsgi.atexit management to gevent
don't increment tx counter on requests that should not be accounted (ping plugin requests)
Merge pull request #245 from prymitive/dont_count_tx_on_pings

don't increment tx counter on requests that should not be accounted
call gevent atexit hook before destroying uwsgi-related greenlets
refactored async mode
added routing support to coroae and fixed backtrace-depth
various async/green mode improvements and fixes
improved stackless plugin
improved fiber support
fixed stackless + threads
fixed cache sync parsing - uwsgi_hooked_parse() was getting invalid data lenght
fixed python async mode with the improved api
another fix in python async mode
Merge pull request #247 from prymitive/cache_sync_fix

fixed cache sync parsing