Added Team table to homepage

* Generated Team scaffold
* Added layout css
* Added some layout divs to template
Added country and player models
Created scraper to get olympic team rosters

* Added href field to country model and player model
* Created Country.fetch_countries and Player.fetch_players_by_country methods
* Added vcr and webmock to make testing scraper faster
* Added test/vcr_cassettes to gitignore since they are only needed for tests