Update to latest packages versions

* Node.js packages:
** express 4.x
** socket.io 1.x

* Bower packages:
** angular 1.2.17
** angular-socket-io 0.6.0
** angular-route 1.2.17


I also remove public/bower_components/ and add this folder into .gitignore.
Need to use 
```shell
bower install
```
before run the app.