Blog Categories #107

Route at `blog/categories` and `blog_categories_path` that renders blogs/categories.haml and displays a tag cloud. CSS classes for the tags are `tag1` through `tag4`. Check out the [acts_as_taggable_on](https://github.com/mbleigh/acts-as-taggable-on) [cloud calculations](https://github.com/mbleigh/acts-as-taggable-on#tag-cloud-calculations) section for documentation.