add browser distribution file

browser/LAYER

@@ -0,0 +1 @@
+105

webpack.config.babel.js

@@ -23,6 +23,7 @@ module.exports = {
         ],
     },
     output: {
+        path: __dirname + '/browser',
         filename: 'gramjs.js',
         libraryTarget: 'var',
         library: 'gramjs',