first test for metric api from apps (perl only)
fixed uwgsi-docs bug 98
fixed typecasting
fixed websocket example for python3
fixed websocket example
fixed sleep in daemons throttle code, sleep() only accepts unsigned int, but in some cases uWSGI could pass value < 0
Merge pull request #424 from prymitive/daemon_fix

daemon throttle code could pass values < 0 to sleep()
completed perl metric api
added sockets metrics
ported rrdtool to the metric api
expose metrics to request logging
exposed the metric routing var
added router_metrics plugin
reimplemented metrics initial_value
added shortcut mode for --metric
added --vassal-set
added restorable metrics
fixed #425
added pluggables metric collectors
completed metric file collector