code: public Slug createSlug(String appName, Map<String, String> processTypes) {
          return connection.execute(new SlugCreate(appName, processTypes), apiKey);
      }
docs: Gets the slug info for an existing slug
  
  @param appName See {@link #listApps} for a list of apps that can be used.
  @param processTypes hash mapping process type names to their respective command