Added support for graphite

Graphite support …
Added new options to support graphite data insertion
 --graphite-root-metric-path The root of the graphite metric path
(default: cfping.)
--carbon-server-ip  IPv4 address of the carbon server
--carbon-port Carbon server port (default: 2003)

It will now push stats to a graphite server 
see http://graphite.wikidot.com/

The message pushed looks as follows
cfping.connect 0.128761053085 1381265548
cfping.container 0.121246099472 1381265548
cfping.create 0.440916776657 1381265548
cfping.write 0.114249944687 1381265548
cfping.read 0.0242509841919 1381265548
cfping.delete 0.04673600197 1381265548
cfping.total 0.37653613091 1381265548