Add error handling to "scripts" and "styles" gulp tasks

Thanks, MWDelaney, Nicolo_Sacchi and epiphron!

gulpfile.js

@@ -67,6 +67,12 @@ var enabled = {
 // Path to the compiled assets manifest in the dist directory
 var revManifest = path.dist + 'assets.json';
 
+// Error checking; produce an error rather than crashing.
+var onError = function(err) {
+  console.log(err.toString());
+  this.emit('end');
+};
+
 // ## Reusable Pipelines
 // See https://github.com/OverZealous/lazypipe
 
@@ -177,6 +183,7 @@ gulp.task('styles', ['wiredep'], function() {
       });
     }
     merged.add(gulp.src(dep.globs, {base: 'styles'})
+      .pipe(plumber({errorHandler: onError}))
       .pipe(cssTasksInstance));
   });
   return merged
@@ -191,6 +198,7 @@ gulp.task('scripts', ['jshint'], function() {
   manifest.forEachDependency('js', function(dep) {
     merged.add(
       gulp.src(dep.globs, {base: 'scripts'})
+        .pipe(plumber({errorHandler: onError}))
         .pipe(jsTasks(dep.name))
     );
   });