Back to using string not ptr
Fixes #40
Set max redis idle connections
Added lua script for wrk
Back to mattn's driver
Fixes #47
Loading IPDB concurrently
Improvements

Loading the IPDB concurrently, counting elapsed time;
Updated HTTP log format to show bytes delivered;
Internal counters (expvar) running on goroutine.
Updated config file parser
Updated WaitGroup
Fixed area_code and metro_code
Fixed area_code and metro_code
Removed goroutine for stats
Removed println
Code review and optimizations
Review and cleanups
Made files' path relative to the config file's dir
Bugfix in redis rate limiter
Review, bugfix handling SIGHUP
Updated comment