Print integration build errors

test/integration/index.js

@@ -9,7 +9,6 @@ var b = browserify()
 // Remove old bundle
 try {
   fs.unlinkSync(bundlePath)
-} catch (e) {}
 
   var writeStream = fs.createWriteStream(bundlePath)
 
@@ -18,4 +17,7 @@ tests.forEach(function (fileName) {
   })
 
   b.bundle().pipe(writeStream)
+} catch (e) {
+  console.error('Integration build failure', e)
+}