Remove fixtures from rspec

We no longer use fixtures, substituting them out for factories
a while ago. Check out this railscast for reasoning.
http://railscasts.com/episodes/158-factories-not-fixtures
Clean up word choice for invalid inputs

We're open source, people. Come on.
Use RESTful routes for Comments Controller

Add feature spec for deleting comments
Add more feature specs for deleting comments
Add feature specs for creating new comments
Move default value logic from model to db/schema
Remove old Comment model spec
Merge pull request #6 from rwash/refactor

Refactor