code: function(languageSlug, projectSlug, resourceSlug) {
          return new Promise(function(resolve, reject) {
                  try {
                      resolve(library.public_getters.getResource(languageSlug, projectSlug, resourceSlug));
                  } catch(err) {
                      reject(err);
                  }
              })
              .then(function(resource) {
                  if(!resource) return Promise.reject(new Error('Unknown resource'));
                  let containerSlug = rc.tools.makeSlug(languageSlug, projectSlug, resourceSlug);
                  let directory = path.join(resourceDir, containerSlug);
                  let archive = directory + '.' + rc.tools.spec.file_ext;
                  return rc.open(archive, directory, opts);
              });
      }
docs: Opens a resource container archive so it's contents can be read.
  The index will be referenced to validate the resource and retrieve the container type.
  
  @param languageSlug {string}
  @param projectSlug {string}
  @param resourceSlug {string}
  @returns {Promise.<Container>}