Adds voting functionality

* Modify migration for create votations table
* Updates db/schema file
* Reduce routes for votes and votations
Adds voting functionality

* Adds previous route for votations
* Fix scope in votations
* Adds more actions for admin votations controller
Adds voting functionality

* Adds links in admin votation#index view
* Adds links in admin votation#new view
Adds voting functionality

* Creates admin votations#previous page
* Creates admin votations#show page