Added developer guide example server.js files.
Remove descriptors for individual apps of the dashboard tutorial.
Added lastest documentation including the dashboard tutorial documentation.
Removed server.js file as we are going with app.js.
Removing server.js files.
Removed server.js files from example apps.
Merge pull request #1284 from zhouyaoji/remove_db_tutorial_app_descriptors

[tests] Remove the test descriptors for the subapps of the dashboard tutorial.
Merge pull request #1285 from zhouyaoji/add_docs

 [docs] Added the updated documentation and the dashboard tutorial.