Added HTTP to HTTPS redirect for servers using SSL

[CannonBallz]

This change allows the server to redirect all http traffic on a specified port to the port used for SSL connections. To enable this option you will need to add two extra options to the server block for SSL servers in config.js, the following example details the options (using standard https and http ports for clarity but not required):

conf.servers.push({
port: "443",
address: "0.0.0.0",
ssl: true,
ssl_key: "example.key",
ssl_ca: "example.ca",
ssl_cert: "example.crt",
// HTTP redirect options
http_redirect: true,
http_redirect_port: "80"
});

(Also updated the spdy require to use https instead of spdy to help deal with web browsers not liking spdy)

[LouisT]

The change from SPDY to https isn't a good one. SPDY is the next step forward in the SSL system; reverting to https just to fix old outdated/broken browsers isn't the correct way to handle this.

[CannonBallz]

This change is actually to fix it in new browsers as the major players seem to be migrating away from SPDY in favour of HTTP/2:
http://blog.chromium.org/2015/02/hello-http2-goodbye-spdy-http-is_9.html