Add test for assignment content link
Prioritize LiveReload over RSpec in Guard
Replace lorem ipsum on home page
Change functionality of "Get Started"

"Get Started" in heading now directs to lessons if logged in. Tweak
styling on button.
Change title bar name
Fix null method error

@coursework is null if the user has come to the page directly
from signup.
Add breadcrumbs

Add breadcrumbs to lessons, assignments, and challenges views.
Rename "Review" in lessons

Rename "Review" to "Repeat" to reduce ambiguous meanings.
Add completed on message to assignments

Add notice that indicates an assignment has been completed.
Add API docs
Add additional seed data

Add duplicate seed data for experience. Add coming soon message
to lesson index.