add InsecureSkipVerify option (insecure skip verify)

It is nice to have an easy way to set InsecureSkipVerify for go 1.3

I am still running into SSL issues on latest codebase and dont care for security yet as i'm in a lab. It should be easy to set this option.

This PR adds the following JSON option to the network section
<pre>
{
  "network": {
    "insecure skip verify": true,
}
</pre>
Nit-picky, but couldn't you write: tlsconfig.InsecureSkipVerify = config.InsecureSkipVerify without the if?