Streamlines is_teacher method in Person model
Fixes links to courses in person#show view
Adds a course and a quiz to seed file
Controllers pass necessary instance variables to views
New person signup now has select menu instead of text field
Course pages show list of quizzes
Adds styling to layout
Adds sweet list styling to course lists
quiz show page lists questions for teachers; filler string for students; fixes "back" link
Merge pull request #3 from jonnyparris/more_views

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