Merge branch 'hotfix/add-ruby-version'
Add rails_12factor to production group
Enable Test Categories CRUD pages
Add/remove subcategories from category
Merge branch 'feature/enable-tree-structure' into develop
Merge branch 'release/v0.3'
Enable static assets
Merge branch 'hotfix/fix-asset-static'
Merge branch 'hotfix/fix-asset-static' into develop
Change gemfile and styles order
Merge branch 'hotfix/change-gemfile' into develop