removed deprecator since it does not work correctly

got rid of vcloud-launcher deprecator, since
- it does not given correct warnings to user and it is misguiding.
- also it is difficult to fix it , since we do not know what all file
  formats it should support
- we should add deprecator in future, if we change the launcher yaml
  file format. also mention this change in github release-notes.
Merge pull request #56 from alphagov/removing_buggy_deprecator

removed deprecator since it does not work correctly