set a timer to track each packet of data on update

lib/update-fetch.js

@@ -163,10 +163,15 @@ exportables.downloadTgz = function(tgzUrl, fileMap) {
       return resolve(files);
     });
 
-
     remote.ifReachable(remote.BUILDS_HOSTNAME).then(() => {
+
       var req = request.get(tgzUrl);
 
+      var startTimeout = () => setTimeout(() => {
+          reject(new Error('The attempt to download a build has timed out. Check your network connection and try again.'));
+        }, 10000);
+      var timeout = startTimeout();
+
       // When we receive the response
       req.on('response', (res) => {
 
@@ -185,6 +190,8 @@ exportables.downloadTgz = function(tgzUrl, fileMap) {
         // When we get incoming data, update the progress bar
         res.on('data', (chunk) => {
           bar.tick(chunk.length);
+          clearTimeout(timeout);
+          timeout = startTimeout();
         });
 
         // unzip and extract the binary tarball