Model specs should test the following:

1. Factories - Default factory should generate a valid object
1. Validations - Data should pass validations
1. Methods - Class and instance methods should perform as expected

The name and location of spec files should mirror the file structure of the /app directory

Use a *sequence* in a factory to deal with uniqueness validations

FactoryGirl Callbacks of note:
* before_build
* after_build
* before_create
* after_create