Add model and tests
Add validates on title and tests on #image. Add hack to activating Shoulda-Matchers and RubyMine ZEUS
Add ImageUploader and tests
Add MiniMagick to test mode and all tests to ImageUploader
Add tests to tree mode in Category.
Add Ancestry to Categories.
Add InheritedResources gem.
Add InheritedResources Views.
Add bootstrap 3.0
Refactor layout
Add simple index and new form for categories
Save Category with InheritedResources
Render trees node
New category form works fine.
Add tests to exists default images
Add scaled images and Refactor tests.
Improve categories index
Add test to delete nodes
Correct tests
Redesign Category edit form