Allow config files with digits only

Resolves #61

Author: ThauEx

lib/config.js

@@ -7,7 +7,11 @@ var config = convict({
   application: {
     config: {
       doc: 'name of the config to load',
-      format: String,
+      format: function check(val) {
+        if (!/^.+$/.test(val)) {
+          throw new Error('must be a string or number');
+        }
+      },
       default: 'default',
       env: 'CONFIG',
       arg: 'config',
@@ -278,10 +282,9 @@ var config = convict({
   },
 });
 
-
 var configFilename = __dirname + '/../config/' + config.get('application.config') + '.yml';
 if (fs.existsSync(configFilename)) {
-  console.log('Using custom config', configFilename);
+  console.log('Using custom config', path.resolve(configFilename));
   try {
     var doc = yaml.safeLoad(fs.readFileSync(configFilename, 'utf8'));
     config.load(doc);