Fixed css minify

gulpfile.js

@@ -25,7 +25,7 @@ gulp.task('usemin', ['templates', 'enable-production'], function() {
     .pipe($.usemin({
       html: [$.minifyHtml({empty: true})],
       js: ['concat', $.ngAnnotate(), $.uglify({outSourceMap: false})],
-      css: [$.minifyCss(), 'concat']
+      css: [$.minifyCss({compatibility: true, keepBreaks: true}), 'concat']
     }))
     .pipe(gulp.dest('dist'));
 });

package.json

@@ -51,13 +51,13 @@
     "gulp-livereload": "^3.0.2",
     "gulp-load-plugins": "^0.4.0",
     "gulp-manifest": "0.0.3",
-    "gulp-minify-css": "^0.3.0",
+    "gulp-minify-css": "^0.3.12",
     "gulp-minify-html": "^0.1.1",
     "gulp-ng-annotate": "~0.3.3",
     "gulp-replace": "^0.2.0",
     "gulp-rev": "^1.1.0",
     "gulp-uglify": "^1.0.2",
-    "gulp-usemin": "^0.3.8",
+    "gulp-usemin": "^0.3.11",
     "gulp-zip": "^0.1.2",
     "http": "0.0.0",
     "st": "^0.5.2"