Event profile page and user joining

Changes:

* It has unstyled HTML
* Joined users counter working
* List of recent joined users with "N time ago"
* Guest user can join with Twitter or Facebook (button must be styled like in home page)
* If authenticated user already joined, show "Joined" button which unjoins him
* If authenticated user didn't join, show "Join" button
* It is possible to upload a big image and thumbnail image (see `_form` to check how the URL is generated)
* It has a map with all user who joined the event / country.
* @RazvanGirmacea you can create the CSS and modify the HTML once this is merged
* @darkunz and @armab please take a look at the code... I am very sleepy now :sleeping: 

Now it is also necessary to add these env vars:

```
fastcgi_param SW_ADMIN_HTTP_USERNAME "koding";
fastcgi_param SW_ADMIN_HTTP_PASSWORD "";
```

They will be used to access events creation/editing page.

To create just go to `event/create`.
To edit just go to `event/#id#/update`.