Initial specs for Bike
Model + Migration for Bike
Oops, 'type' is not a good column name.  Migration to rename to 'category'
Change Bike 'type' to 'category' in user/bike specs
Add has_many bikes relationship to User
Specs for rental
Add created_at/updated_at timestamps to Bike table
Merge branch 'bikes' into rentals
Model + Migration for Rentals
Add has_many rentals to Bike
Implement Rental#status and Rental#owner
Add 2 more tests for Rental#status for current rentals
Change be_true to be true in User specs for rentals_as_owner and rentals_as_renter