add nconf env loader

src/nconf_load_env.js

@@ -0,0 +1,41 @@
+const env_whitelist = [ "CONTROL_PORT", 
+						"TOR_PATH", 
+						"INSTANCES", 
+						"SOCKS_PORT", 
+						"DNS_PORT", 
+						"HTTP_PORT", 
+						"LOG_LEVEL", 
+						'PARENT_DATA_DIRECTORIES', 
+						'LOAD_BALANCE_METHOD', 
+						"controlPort", 
+						"torPath", 
+						"instances", 
+						"socksPort", 
+						"dnsPort", 
+						"httpPort", 
+						"logLevel", 
+						'parentDataDirectories', 
+						'loadBalanceMethod'
+					];
+
+module.exports = (nconf) => {
+	return nconf
+		.env({
+		whitelist: env_whitelist,
+		parseValues: true,
+		transform: (obj) => {
+			if (env_whitelist.includes(obj.key)) {
+				if (obj.key.indexOf('_') !== -1) {
+					let a = obj.key.toLowerCase().split('_');
+					i = 1;
+					while (i < a.length) {
+						a[i] = a[i][0].toUpperCase() + a[i].substr(1);
+						i++;
+					}
+					obj.key = a.join('');
+				}
+			}
+			return obj;
+		}
+	});
+};