add categories table
add categories table
add categories table
add categories table
add tags table, again
create models for articles, categories, and tags
transfer categories data to categories table
add join table for articles and tags
renamed tags column in articles
add associations to models
transfer tag data to tags table
deleted extraneous article_id column from tags
new routes
build out article controller and view for index
Add redirect to new url format and show article
Add category index and related links and routes
Add ability to create new articles
Add ability to view articles by tag
add rspec and shoulda matchers
Create model tests