Add download theme command (#8)

* Add a new command: trb new theme theme-name that uploads and unzips the theme

Author: nikola-wd

commands/setup_theme.js

@@ -1,7 +1,7 @@
 import fs from 'fs';
 import path from 'path';
 import fetch from 'node-fetch';
-import AdmZip from 'adm-zip';
+var AdmZip = require('adm-zip');
 import ProgressBar from 'progress';
 import ora from 'ora';
 import chalk from 'chalk';