Bootstrap
Add skin and attribute models
Fix attributes migration
Rename attributes into properties to avoid ActiveRecord errors
Add nested attributes creation in Skin
Change type of column value to binary in table properties
Add routes and skeleton of create methods in controllers
Remove sqlite in production
Scope Api
REmove database.yml
Update gems
Readd secret token
Fix secret token
Implemented create skin
Implemented Skins index
Ensure request/response format is set to JSON
Changed property model
Implemented Skins show
Use relative links
Add serializers