add collection references to ec2 models

lib/fog/aws/models/ec2/address.rb

@@ -7,6 +7,10 @@ module Fog
         attribute :instance_id, 'instanceId'
         attribute :public_ip,   'publicIp'
 
+        def addresses
+          @addresses
+        end
+
         def delete
           connection.release_address(@public_ip)
           true
@@ -18,6 +22,12 @@ module Fog
           true
         end
 
+        private
+
+        def addresses=(new_addresses)
+          @addresses = new_addresses
+        end
+
       end
 
     end

lib/fog/aws/models/ec2/addresses.rb

@@ -13,6 +13,7 @@ module Fog
           addresses = Fog::AWS::EC2::Addresses.new(:connection => connection)
           data['addressesSet'].each do |address|
             addresses << Fog::AWS::EC2::Address.new({
+              :addresses  => self,
               :connection => connection
             }.merge!(address))
           end

lib/fog/aws/models/ec2/instance.rb

@@ -53,6 +53,10 @@ module Fog
           @key_name = new_keypair.name
         end
 
+        def instances
+          @instances
+        end
+
         def monitoring=(new_monitoring)
           if new_monitoring.is_a?(Hash)
             @monitoring = new_monitoring['state']
@@ -115,6 +119,10 @@ module Fog
           @instance_state = new_instance_state['name']
         end
 
+        def instances=(new_instances)
+          @instances = new_instances
+        end
+
       end
 
     end

lib/fog/aws/models/ec2/instances.rb

@@ -13,7 +13,8 @@ module Fog
           instances = Fog::AWS::EC2::Instances.new(:connection => connection)
           data['instancesSet'].each do |instance|
             instances << Fog::AWS::EC2::Instances.new({
-              :connection => connection
+              :connection => connection,
+              :instances  => self
             }.merge!(instance))
           end
           instances

lib/fog/aws/models/ec2/key_pair.rb

@@ -13,6 +13,10 @@ module Fog
           true
         end
 
+        def key_pairs
+          @key_pairs
+        end
+
         def save
           data = connection.create_key_pair(@name).body
           new_attributes = data.reject {|key,value| !['keyFingerprint', 'keyMaterial', 'keyName'].include?(key)}
@@ -20,6 +24,12 @@ module Fog
           true
         end
 
+        private
+
+        def key_pairs=(new_key_pairs)
+          @key_pairs = new_key_pairs
+        end
+
       end
 
     end

lib/fog/aws/models/ec2/key_pairs.rb

@@ -13,7 +13,8 @@ module Fog
           key_pairs = Fog::AWS::EC2::KeyPairs.new(:connection => connection)
           data['keySet'].each do |key|
             key_pairs << Fog::AWS::EC2::KeyPair.new({
-              :connection => connection
+              :connection => connection,
+              :key_pairs  => self
             }.merge!(key))
           end
           key_pairs

lib/fog/aws/models/ec2/security_groups.rb

@@ -13,7 +13,8 @@ module Fog
           security_groups = Fog::AWS::EC2::SecurityGroups.new(:connection => connection)
           data['securityGroupInfo'].each do |security_group|
             security_groups << Fog::AWS::EC2::SecurityGroup.new({
-              :connection => connection
+              :connection       => connection,
+              :security_groups  => self
             }.merge!(security_group))
           end
           security_groups

lib/fog/aws/models/ec2/snapshots.rb

@@ -13,7 +13,8 @@ module Fog
           snapshots = Fog::AWS::EC2::Snapshots.new(:connection => connection)
           data['snapshotSet'].each do |snapshot|
             snapshots << Fog::AWS::EC2::Snapshot.new({
-              :connection => connection
+              :connection => connection,
+              :snapshots  => self
             }.merge!(snapshot))
           end
           snapshots

lib/fog/aws/models/ec2/volume.rb

@@ -42,6 +42,16 @@ module Fog
           end
         end
 
+        def volumes
+          @volumes
+        end
+
+        private
+
+        def volumes=(new_volumes)
+          @volumes = new_volumes
+        end
+
       end
 
     end

lib/fog/aws/models/ec2/volumes.rb

@@ -13,7 +13,8 @@ module Fog
           volumes = Fog::AWS::EC2::Volumes.new(:connection => connection)
           data['volumeSet'].each do |volume|
             volumes << Fog::AWS::EC2::Volume.new({
-              :connection => connection
+              :connection => connection,
+              :volumes    => self
             }.merge!(volume))
           end
           volumes