added blog example

Guys check this out @jwanjohi @ekra @wangarisharon @kerubo @loisenjoki
@chris27tina for learning purposes

You have to go through the code base

Changelog
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changed `app/config/app.php` Providers array
changed `composer.json`
added `app/controllers/PostsController.php`
added `app/models/Post.php`
added `app/database/migrations/2014_07_23_142403_create_posts_table.php`
added `app/views/posts`
added `app/views/blog.blade.php`
changed `app/routes.php`