Added Apache log traffic per country counter.

Receives Apache common log files, either by stdin or by argument (file
name)
and prints the amount of traffic generated by country, in descending
order
by traffic. IP information is retrieved from http://api.hostip.info.

Typical usage: ./apache_traffic_by_country.py [LOG FILE]...
or: cat [LOG FILE] | ./apache_traffic_by_country.py