Merge pull request #32 from bryankang/css-on-exit

Prevent exiting on css error

gulpfile.babel.js

@@ -21,6 +21,7 @@ gulp.task("build-preview", ["css", "js", "hugo-preview"]);
 gulp.task("css", () => (
   gulp.src("./src/css/*.css")
     .pipe(postcss([cssImport({from: "./src/css/main.css"}), cssnext()]))
+    .on("error", swallowError)
     .pipe(gulp.dest("./dist/css"))
     .pipe(browserSync.stream())
 ));
@@ -63,3 +64,8 @@ function buildSite(cb, options) {
     }
   });
 }
+
+function swallowError(error) {
+  console.error(error.toString());
+  this.emit("end");
+}