Added winners table migration.
Create winner model & relationships.
Added route and controller.
Added category filter to candidates index.
Make rank nullable.
Create/store new winners.
Edit and update winners.
Added winners edit form.
Created winners index.
Added cateogry to winners index.
Order winners index by category, then by rank.
Added link to candidate page to winners index.
Nevermind, let's make it link to the edit winner page.
ye ol' copy paste mistake.
Spelling.
Merge pull request #261 from DoSomething/add-winners-table

Add winners table