refactor: drop download, runs on node 6

Fixes #19

Author: Jan Krems

lib/download.js

@@ -30,7 +30,10 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 'use strict';
-var download = require('download');
+var fs = require('fs');
+var path = require('path');
+
+var request = require('request');
 
 function parseHashes(rawHash) {
   function parse(result, hash) {
@@ -46,18 +49,18 @@ function parseHashes(rawHash) {
 
 function downloadWithMD5(url, destinationDir, fileName, callback) {
   var hash = null;
-  var fileOptions = {
-    url: url,
-    name: fileName
-  };
-  var stream = download(fileOptions, destinationDir);
+  var stream = request(url, { gzip: true });
+  var fileStream = fs.createWriteStream(path.join(destinationDir, fileName));
+  stream.pipe(fileStream);
   stream.on('response', function onResponse(response) {
     var rawHash;
     rawHash = response.headers['x-goog-hash'];
     hash = parseHashes(rawHash).md5;
   });
   stream.on('error', callback);
-  stream.on('close', function returnHash() {
+  fileStream.on('error', callback);
+
+  fileStream.on('close', function returnHash() {
     callback(null, hash);
   });
 }

package.json

@@ -27,8 +27,6 @@
   "dependencies": {
     "adm-zip": "~0.4.4",
     "async": "~0.2.10",
-    "download": "~0.1.11",
-    "follow-redirects": "0.0.3",
     "fs.extra": "^1.2.1",
     "lodash": "^4.6.1",
     "mkdirp": "~0.3.5",