Updated configuration file name

Renamed the configuration file to be a JSON rather than a JS so that multi-file editors such as Visual Studio Code and Notepad++ which rely on the file type for syntax highlighting and correction work properly.

server.js

@@ -11,7 +11,7 @@ var connect_rate_limit = require('connect-ratelimit');
 var DocumentHandler = require('./lib/document_handler');
 
 // Load the configuration and set some defaults
-var config = JSON.parse(fs.readFileSync('./config.js', 'utf8'));
+var config = JSON.parse(fs.readFileSync('./config.json', 'utf8'));
 config.port = process.env.PORT || config.port || 7777;
 config.host = process.env.HOST || config.host || 'localhost';