Add helper class %n

Add helper class as placeholder selector for float none
Change layout markup

using the actual layout classes
Add  layout corrections for the blog layout
Change permalink for blog posts
Add gif

Add example gifs (internal & external)
Add post categories
Display post categories
Add intro page
Add layout and title for zoo
Add category Sass file
Add internal gif for blog post (examplary)
add category output to blog layouts
Add a category page
Add css files to gitignore
Merge pull request #3 from zoepage/master

Master