Add passphrase support to SSL

lib/config.js

@@ -22,6 +22,7 @@ var defaults = {
     "io-host"             : "0.0.0.0",
     "enable-ssl"          : false,
     "ssl-keyfile"         : "",
+    "ssl-passphrase"      : "",
     "ssl-certfile"        : "",
     "ssl-port"            : 443,
     "asset-cache-ttl"     : 0,

lib/server.js

@@ -218,6 +218,7 @@ var Server = {
 
             var options = {
                 key: key,
+                passphrase: self.cfg["ssl-passphrase"],
                 cert: cert
             };