test: move ast.json around

Author: eush77

test/ast.json test/lib/ast.jsontest/ast.json renamed to test/lib/ast.json

@@ -1,7 +1,7 @@
 'use strict';
 
 var select = require('..'),
-    ast = require('./ast'),
+    ast = require('./lib/ast'),
     path = require('./lib/path');
 
 var test = require('tape');