Added client/viewmodel directory and changes some files. see comment

1. 979d779
    * Removed some packages from the development.
2. f8b3550
    * Replaced Login/signup link with Meteor.account.ui loginButtons
3. 514cf2e
    * Added some simple permissions. We can add anything here as we go on.
4. 7ee53e4
    * Added Meteor.publish
5. 109a56f
    * Remove client.js and added new directory "viewmodel"