TCP| Additional tcp metrics for linux
TCP| Added equivalent metrics for BSD

Parse the results from nestat summary which is not ideal
I have tried to use ctype and make calls to sysctl which is what netstat
does under the hood but the values were not correct and this works

tested on Mac OSX and on a OpenBSD 5.3 VM
TCP| Added equivalent metrics for Solaris

Tested on a Solaris 11 VM from Oracle
TCP| Correct typo
TCP| Factor regex + submit code
TCP | Add example of Solaris Netstat output
TCP Metrics| Use rate instead of Gauge
TCP metrics| Assert that the tcp metrics are collected
TCP Metrics| Take the regex at the module level to not recompile them
several times
TCP Metrics| Replace dict of regex metrics by list of tuples
Merge branch 'master' into additional_tcp_metrics
Update Changelog
Merge with additional_tcp_metrics