Add selected attribute to asset
added campaign model and collection to backbone
added nested resources for campaign rewards and added rewards model and collection
Add selected attribute to logos
added front end campaign design
merging backend

Merge branch 'master' into campaign-ui
PUT requests to companies with logo_id will set selected attribute to true
Merge conflicts
Remove comment and fix stylesheet merge conflicts
Add missing brace in stylesheet
Asset migration
create campaign
Post rank algorithm
Documentation and tests
removed route nesting #headache
Setup for token auth
added campaign creation ui
Add about page
connected ui to backend
Company and user guide and images filled in