Merge pull request #126 from rNavarrete/homepage

Homepage
add validation for item category
clean up item category files
Merge pull request #127 from rNavarrete/item_category_validation

Item category validation
added container to admin add category form
Merge pull request #130 from rNavarrete/add_category_container

added container to admin add category form
Change seed data, require categories_id
Fix merge conflict with validations and specs