upgrade uglify to improve compressed size

grunt/browser_clients.js

@@ -67,5 +67,4 @@ module.exports = function (grunt) {
       throw new Error('Aborting release');
     }
   });
-
-};
+};

grunt/config/uglify.js

@@ -4,6 +4,35 @@ module.exports = {
       '<%= distDir %>/elasticsearch.min.js': '<%= distDir %>/elasticsearch.js',
       '<%= distDir %>/elasticsearch.angular.min.js': '<%= distDir %>/elasticsearch.angular.js',
       '<%= distDir %>/elasticsearch.jquery.min.js': '<%= distDir %>/elasticsearch.jquery.js'
+    },
+    options: {
+      compress: {
+        sequences: true,
+        properties: true,
+        dead_code: true,
+        drop_debugger: true,
+        unsafe: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        hoist_funs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        negate_iife: true,
+
+        pure_getters: false,
+        drop_console: false,
+        keep_fargs: false,
+        keep_fnames: false
+      },
+      preserveComments: false,
+      screwIE8: true,
+      mangleProperties: true,
+      reserveDOMProperties: true
     }
   }
-};
+};

package.json

@@ -57,7 +57,7 @@
     "grunt-contrib-compress": "~0.5.3",
     "grunt-contrib-concat": "~0.3.0",
     "grunt-contrib-copy": "~0.4.1",
-    "grunt-contrib-uglify": "~0.2.7",
+    "grunt-contrib-uglify": "^0.11.0",
     "grunt-contrib-watch": "~0.5.3",
     "grunt-esvm": "^2.0.0",
     "grunt-mocha-cov": "^0.4.0",