create courses, sections, and lessons models and run migrations
add associations
migrations to remove unique indexes from titles of lessons and sections
remove the courses ID from lessons
switch associations to HM throughs
fix validations for lesson.course
update roadmap
set up sample seed data for courses, sections and lessons
add commented out code for later use to stop generating annoying rspec files
add courses and lessons controllers and start messing with routes
add columns and indexes for url-friendly titles in courses, sections and lessons
update attr_accessible params and seed file to handle :title_url columns
migrate new position column into courses and ensure heirarchy of courses and lessons displays properly
add new columns for What Youll Learn, What Youll Build and Teaser to courses
set up basic display of courses index
rough cut of courses list page
add description column to sections
add brief_desc column to courses
set up basic lessons list on a course page
build basic lesson show page