Adds voting functionality

* Creates migration for votes table
* Updates db/schema file
Adds voting functionality

* Adds relation between user and votation
* Adds relation between vote and votation
* Creates new model vote and relations and validations
Adds voting functionality

* Fix issue with html in admin section
* Adds link to votations in badges#show view
* Adds more links in partials
* Adds votation routes in config/routes
Adds voting functionality

* Adds vote fabricator
* Adds specs for vote model
Adds voting functionality

* Adds specs for votations controller
* Adds specs for votes controller
Adds voting functionality

* Creates votations controller
* Creates votes controller
Adds voting functionality

* Creates votation#index page
Adds voting functionality

* Change redirect to votations in admin votations controller
* Filter votations by current votations
* Adds scope in votation model
* Fix admin votations controller spec
Merge pull request #82 from crowdint/feature/voting-mvp

Feature/voting mvp