GENERATING A REFRESH TOKEN
==========================

STEP 1
------

* Go to http://cloud.google.com/console and log-in
    * Activate youtube-data API (APIs & auth -> APIs)
    * Register a new app (APIs & auth -> registered apps)
        * Name it, select `native`
        * Write down your `client-id` and `client-secret`

Marks: https://developers.google.com/console/help/new

* Set $client_id and in `step1_url.php` and `step2_refresh_token.php`

* `$ php step1_url.php` and open the url in your browser
    * Write down the auth code ('code' in `step2_refresh_token.php`).

* Set 'client_secret' and 'code' in `step2_refresh_token.php`

* `$ php step2_refresh_token.php`
    * Write down your refresh token

* Save your client-id, client-secret and refresh-token

See more info on this thread: http://stackoverflow.com/questions/8257678/google-calendar-api-v3-hardcoded-credentials

See more info about client scret: http://stackoverflow.com/questions/15547019/how-do-i-find-the-googles-oauth-2-0-client-secret-key-for-developing-chrome-ext