reverted to cssnano with safe: true. closes #144

Author: jadjoubran

package.json

@@ -38,17 +38,17 @@
     "eslint-plugin-angular": "^0.15.0",
     "gulp-concat": "^2.6.0",
     "gulp-concat-sourcemap": "^1.3.1",
+    "gulp-cssnano": "^2.1.1",
     "gulp-eslint": "^1.1.1",
     "gulp-filter": "^1.0.2",
     "gulp-htmlmin": "^1.3.0",
     "gulp-if": "^1.2.5",
-    "gulp-minify-css": "^1.2.3",
     "gulp-ng-annotate": "^1",
     "gulp-ng-html2js": "^0.2.0",
     "gulp-notify": "^2.0.0",
     "gulp-sourcemaps": "^1",
     "gulp-uglify": "^1",
-    "laravel-elixir": "^4.0.0",
+    "laravel-elixir": "^4.2.1",
     "laravel-elixir-livereload": "^1.1.1",
     "main-bower-files": "^2.1.0",
     "underscore": "^1.8.3"

tasks/bower.task.js

@@ -5,7 +5,7 @@ var gulp = require('gulp');
 var mainBowerFiles = require('main-bower-files');
 var filter = require('gulp-filter');
 var notify = require('gulp-notify');
-var minify = require('gulp-minify-css');
+var cssnano = require('gulp-cssnano');
 var uglify = require('gulp-uglify');
 var concat_sm = require('gulp-concat-sourcemap');
 var concat = require('gulp-concat');
@@ -55,7 +55,7 @@ Elixir.extend('bower', function(jsOutputFile, jsOutputFolder, cssOutputFile, css
 			.on('error', onError)
 			.pipe(filter('**/*.css'))
 			.pipe(concat(cssFile))
-			.pipe(gulpIf(config.production, minify()))
+			.pipe(gulpIf(config.production, cssnano({safe: true})))
 			.pipe(gulp.dest(cssOutputFolder || config.css.outputFolder))
 			.pipe(notify({
 				title: 'Laravel Elixir',