Adding pagination class
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Highlights:
- Paginating index page to show set of photos, instead of all in one page

Files:
- modified:   includes/database_objects.php
- modified:   includes/initialize.php
- new file:   includes/paginations.php
- new file:   public/images/group-flowers.jpg
- new file:   public/images/random_colors.jpg
- new file:   public/images/rose-burst.jpg
- modified:   public/index.php
- modified:   public/stylesheets/main.css