Delete unused PetAttribute model files

Oh right, this powered `Color` and `Species` back before they were
database rows. Now these base classes are unused! Goodbye!

app/models/pet_attribute.rb

@@ -1,55 +0,0 @@
-class PetAttribute < StaticResource
-  def as_json(options={})
-    {
-      :id => self.id,
-      :name => self.human_name
-    }
-  end
-
-  def human_name
-    @human_name ||= self.name.split(' ').each { |word| word.capitalize! }.join(' ')
-  end
-
-  class << self
-    def all_ordered_by_name
-      @objects_ordered_by_name
-    end
-
-    def find(id)
-      attribute = super
-      unless attribute
-        attribute = new
-        attribute.id = id
-        attribute.name = "color \##{id}"
-      end
-      attribute
-    end
-
-    def find_by_name(name)
-      @objects_by_name[name.downcase]
-    end
-  end
-
-  private
-
-  def self.data_source
-    "#{to_s.downcase.pluralize}.txt"
-  end
-
-  def self.process_line(line)
-    name = line.chomp.downcase
-    @objects << @objects_by_name[name] = species = new
-    species.id = @objects.size
-    species.name = name
-  end
-
-  def self.fetch_objects!
-    @objects = []
-    @objects_by_name = {}
-    File.open(Rails.root.join('config', data_source)).each do |line|
-      process_line(line)
-    end
-    @objects_ordered_by_name = @objects.sort { |a,b| a.name <=> b.name }
-  end
-end
-

app/models/static_resource.rb

@@ -1,25 +0,0 @@
-class StaticResource
-  attr_accessor :id, :name
-  
-  def self.all
-    @objects
-  end
-  
-  def self.find(id_or_ids)
-    if id_or_ids.is_a?(Array)
-      id_or_ids.uniq.map { |id| find_one(id) }
-    else
-      find_one(id_or_ids)
-    end
-  end
-  
-  def self.count
-    @objects.size
-  end
-  
-  private
-  
-  def self.find_one(id)
-    @objects[id - 1]
-  end
-end