Dont make config.toml mandatory

Fixes #38

sitegin/config.js

@@ -45,9 +45,13 @@ module.exports = function() {
     };
     var configFile = path.join(config.sourceDir, 'config.toml');
     fs.readFile(configFile,'utf-8',function(err,data) {
-      if(err) return reject('Error reading '+configFile);
+      if(err) {
+        console.log('Failed to read configuration from '+configFile);
+        console.log('Using defaults')
+        return resolve({config: config});
+      }
       data = toml.parse(data);
-      console.log(data);
+      console.log('data: '+data);
       for(let attr in config) { data[attr] = config[attr]; }
       resolve({config: data});
     })