API: Remove diff module level

Author: jonnor

bin/fbp-diff

@@ -1,3 +1,3 @@
 #!/usr/bin/env node
 fbpdiff = require('../');
-fbpdiff.diff.main();
+fbpdiff.main();

index.js

@@ -1,6 +1,4 @@
 require('coffee-script/register');
 var diff = require('./src/diff');
 
-module.exports = {
-    diff: diff,
-};
+module.exports = diff;