Adds support for easily creating custom preferences for models
How to install it in a Rails app?
uninitialized constant Preferences::InstanceMethods::Preference
Rails 4 issue (undefined method `class_inheritable_hash' for #<Class:0x007fa482432578>):
undefined method `named_scope' for #<Class:0x00000103606a90>
rails 3 working?
`type_cast' for nil:NilClass (NoMethodError)