Improve readbility of blog posts

Before:
![restful_module_and_gizra__bash__11225](https://cloud.githubusercontent.com/assets/125707/3516121/1ae1928e-06dd-11e4-976c-b251520c2d0c.jpg)


After:
* narrowed area
* bigger fonts
* Better spacing between elements
![restful_module](https://cloud.githubusercontent.com/assets/125707/3516114/ffe50eb6-06dc-11e4-9f6d-0982aa081a69.jpg)