Fix dying when error occurs in less evaluation

gulp-less@1.2.4 was breaking release and gulp-plumber stopped working

Author: PavelGavlik

package.json

@@ -43,7 +43,7 @@
     "gulp-imagemin": "^0.1.5",
     "gulp-jscs": "^0.5.0",
     "gulp-jshint": "^1.6.1",
-    "gulp-less": "~1.2.3",
+    "gulp-less": "^1.3.1",
     "gulp-livereload": "^2.1.0",
     "gulp-load-plugins": "^0.5.0",
     "gulp-newer": "~0.3.0",