updated class to a more sexy way of creating classes in js

[rhwy]

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[rhwy]

This was re-opened after a mistake branches removed before pull request was merged!.

one solution:

• get the SHA1 of the commits involved in the pull request from the github interface
• on the computer on which the branches were removed (and that has the history), you can pick the commits:
  • create a branch with the same original name (the one used in the PR) and checkout
  • git cherry-pick mySHA1 to integrate the commits in this branch
  • git logto verify that the last commits not pushed are the ones you just re-integrate
  • git push origin mybranch to push things to github and recreate a branch with the same name that can be automatically understood by github
  • the you can re-open the PR