v0.11.1

Fixed

• Fix bug that $this->input->get_request_header() returns the first header value for all tests. See #92.
• Fix bug that config values are not reset between tests. See #94.
• Fix bug that CI_Output::_display() is called even if you call a controller method directly (when you pass an array to the 2nd argument of $this->request()).

Others

• Improved documentation for $this->request().