Added TLS support for API and many other TLS related changes.

src/config.json

@@ -77,6 +77,15 @@
     "retries": 5,
     "retry-pause": 5,
     "syslog": false,
+    "tls": {
+        "enabled": false,
+        "protocols": null,
+        "cert": null,
+        "cert_key": null,
+        "ciphers": null,
+        "ciphersuites": null,
+        "dhparam": null
+    },
     "user-agent": null,
     "verbose": 0,
     "watch": true