code: def install_json(self):
          
          if self._install_json is None:
              try:
                  install_json_filename = os.path.join(os.getcwd(), 'install.json')
                  with open(install_json_filename, 'r') as fh:
                      self._install_json = json.load(fh)
              except IOError:
                  self.log.warning(u'Could not retrieve App Data.')
                  self._install_json = {}
          return self._install_json
docs: Return contents of install.json configuration file, loading from disk if required.