moved to es6 module system

scripts/test-prepare.js

@@ -0,0 +1,8 @@
+var fs = require('fs');
+
+var data = fs.readFileSync('build/tests/tests/docxTest.js'); //read existing contents into data
+var fd = fs.openSync('build/tests/tests/docxTest.js', 'w+');
+var buffer = new Buffer('var docx = require("../docx/docx");');
+fs.writeSync(fd, buffer, 0, buffer.length); //write new data
+fs.writeSync(fd, data, 0, data.length); //append old data
+fs.close(fd);