added redis socket support

In order to enable socket support I added another command line argument: `--sock` which can be true or false.
If set to true the script will try to connect via sockets to the redis host provided via the `--redis` flag. In
that case the port will be omitted.

config.js

@@ -22,6 +22,7 @@ exports.googleanalytics = {
 
 var redis_conf = argv.redis || '127.0.0.1:6379';
 exports.database = {
+	sock: argv['sock'] || false,
 	type: 'redis',
 	prefix: '#scrumblr#',
 	host: redis_conf.split(':')[0] || '127.0.0.1',