code: def __git_tag(git_tag):
          
          command = ['git', 'tag', '-a', git_tag, '-m', '\'' + git_tag + '\'']
          Shell.msg('Create tag from version ' + git_tag)
  
          if APISettings.DEBUG:
              Git.__debug(command, False)
  
          if not call(command):
              return True
          return False
docs: Create new tag.
          The function call will return 0 if the command success.