Reorganize Gemfile.
Create clicks table to store short_code analytics.
Basic click specs.
Pass click specs.
Remove specs that test Click functionality.
Add Addressable/URI
Update specs.
Clean links to remove query params.
Remove num_clicks column from links in favor of clicks join table.
Refactor tests to use factory and subject.
Pass short_code_spec
Add #num_clicks and #num_uniques.
Remove num_clicks column; favor clicks table.
Add #percentage_traffic.