Add index, create, and new functionality for Cat model
Add timestamps to Cat model
Add #age to Cat model
Fix validation code for Cat color
Remove create.html view
Add #edit method for Cat model
Add validation for sex to Cat model
Add #update method for Cat model
Make index method look better
Add #show method to Cat model
Do cat_rental_requests migration and fix schema for Cat model
Fix cat info display
Add age display for cats
Add CatRentalRequest model and controller (with #index)
Add #show method to CatRentalRequestsController and corresponding view
Add associations between Cat and CatRentalRequest models
Add better-errors to Gemfile
Add CatRentalRequestsController#new, #create, and #edit
Add CatRentalRequestsController#update
Add list of rental requests to Cat #show view