Assets 4

A slightly improved speed of about 2%
Added option --intensity, sets maximum intensity.
Added support for configuration files.
Added option --config, sets the name of the config file.
Added support for failover servers, through config files.
Added new values to the api method getstat.
Added http api you can use address to get statistics.
Added simple web page with statistics, simply open the api address in the web browser. (Experemental)
Fixed couple of bugs.