Lowercase only header keys, not values. Fixes #572
fix tnetstring support #562
added uwsgi::add_var to perl
prepare for 2.0.3 release
Merge pull request #573 from prymitive/spdy_fix

Lowercase only header keys, not values.
fixed segfault for unnamed loggers
added rpc hook
fixed #575
fixed #557 for --lazy-apps
fixed fatal hooks management
added no_headers option to keyval based static routers, fixes #576
added setmodifier1 and setmodifier2