Add browser support (#1)

* add browser test target
* add browser-manual target

example.js

@@ -18,3 +18,5 @@ var plainText = new Buffer(cipher.length - sodium.crypto_secretbox_MACBYTES)
 sodium.crypto_secretbox_open_easy(plainText, cipher, nonce, key)
 
 console.log('Plaintext:', plainText.toString())
+
+if (typeof window !== 'undefined') window.close()

package.json

@@ -9,9 +9,13 @@
     "siphash24": "^1.0.1"
   },
   "devDependencies": {
+    "browser-run": "^4.0.2",
+    "browserify": "^14.1.0",
     "sodium-test": "^0.4.0"
   },
   "scripts": {
+    "browser": "browserify example.js | browser-run",
+    "browser-manual": "browserify example.js | browser-run -p 1234",
     "test": " node test.js"
   },
   "browserify": {