Add ShortUrl#expand and other functionality.
Start CLI script and start visit tracking methods in ShortUrl.
Finish initial version of ShortUrl#num_visits #who_visited #visits_last_10_mins.
Adds visit tracking to url_shortener_CLI
Add validation in models.
Fix mistake from earlier migration.
initial commit
Rocked through the models and db migrations.
Add validate_responder_not_author and start other validator.
Add second validator.
Add Question#results.
Add dependent destruction.
Add indexes to foreign keys in responses, polls, and questions.
Subtree merged in: w3d3
Subtree merged: w3d4