gulpfile update

gulpfile.js

@@ -1,6 +1,6 @@
 var path = require("path");
 var gulp = require("gulp");
-var gulp_if = require("gulp-if");
+var _if = require("gulp-if");
 var sass = require("gulp-sass");
 var babel = require("babelify");
 var minify_css = require("gulp-minify-css");
@@ -64,7 +64,7 @@ gulp.task("compile", function(){
 		.pipe(browserify({
 			transform: [annotate, babel]
 		}))
-		.pipe(gulp_if(is_production, uglify()))
+		.pipe(_if(is_production, uglify()))
 		.pipe(gulp.dest("public"));
 });