Corrected spelling errors
Updating gems
Cleanup spec syntax
Use ActiveSupport::Autoload
Option to skip raise on unknown attributes
Remove definition of #attribute_names

This instance method already magically provided
by .class_attribute
Store attribute names sorted
Hilda moved to Stockholm
Fixed spelling error
Added Entasis::TransposeKeys
Renamed option :allow_unknown to :ignore_undefined
Rename .entasis_config to .attributes_config
Updated readme and history
Bump version to 0.4.0