Add a watch script for the server extension

README.md

@@ -58,6 +58,14 @@ npm run build:serverextension
 
 to build the changes and refresh your browser to see the changes.
 
+To have the system build after each change to the source files, run:
+ 
+```bash
+npm run watch:serverextension
+```
+
+and refresh the browser after each sucessful update.
+
 
 NPM Package
 -----------

package.json

@@ -79,6 +79,7 @@
     "test:firefox": "karma start --browsers=Firefox test/karma.conf.js",
     "test:ie": "karma start --browsers=IE test/karma.conf.js",
     "watch": "watch 'npm run build' src --wait 10",
+    "watch:serverextension": "watch 'npm run build:serverextension' src --wait 10",
     "watch:test": "watch 'npm run build && npm test' src test/src --wait 10"
   },
   "repository": {