Fixed Iord::OutputHelper.image and its call in Iord::Field
Added key `:as` for display-oriented attributes to override the field name
Added `json_attrs` as shortcut for both `json_***_attrs` methods.
Fixed hazardous value retrieving in field_name.
using alias_method instead of alias in controller
Added `has_collection?` to handle correctly singleton resource.
Added `form_resource_url`
Correclty handling singleton resources
added tests for namespaced singleton resource
Merge branch 'feature/singleton_resource'
bump v0.2.0
Added Iord::Nested for nested resources
Merge branch 'feature/nested'
bump to v0.3.0