Add testing gems.
Add FactoryGirl configs.
Add guard setup.
Fix FactoryGirl configs.
Add shoulda-matchers.
Refactor user specs.
Add link specs and start using FactoryGirl factories.
Start specing out ShortCodes.
Debug password storage test.
Remove massign assignment tests; Rails 4 has strong parameters.
Add num_clicks column to links table.
Add click incrementor.
Add click counter to links.
Add num_clicks column to short_codes table.
Pass short_code specs.