code: protected static void addHeaders(Selenified clazz, ITestContext context, Map<String, Object> headers) {
          context.setAttribute(clazz.getClass().getName() + "Headers", headers);
      }
docs: Sets any additional headers for the web services calls for each instance of the test suite being executed.
  
  @param clazz   - the test suite class, used for making threadsafe storage of
  application, allowing suites to have independent applications
  under test, run at the same time
  @param context - the TestNG context associated with the test suite, used for
  storing app url information
  @param headers - what headers do we want to set for this particular test suite