more consistent naming for timestamp attributes

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

@@ -15,7 +15,7 @@ module Fog
         attribute :type,              'instanceType'
         attribute :kernel_id,         'kernelId'
         attribute :key_name,          'keyName'
-        attribute :launch_time,       'launchTime'
+        attribute :created_at,        'launchTime'
         attribute :monitoring
         attribute :product_codes,     'productCodes'
         attribute :private_dns_name,  'privateDnsName'

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

@@ -7,9 +7,9 @@ module Fog
         identity  :id, 'snapshotId'
 
         attribute :progress
-        attribute :start_time,  'startTime'
+        attribute :created_at,  'startTime'
         attribute :status
-        attribute :volume_id,    'volumeId'
+        attribute :volume_id,   'volumeId'
 
         def destroy
           requires :id

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

@@ -6,9 +6,9 @@ module Fog
 
         identity  :id,         'volumeId'
 
-        attribute :attach_time,       'attachTime'
+        attribute :attached_at,       'attachTime'
         attribute :availability_zone, 'availabilityZone'
-        attribute :create_time,       'createTime'
+        attribute :created_at,        'createTime'
         attribute :device
         attribute :server_id,         'instanceId'
         attribute :size

lib/fog/rackspace/models/servers/image.rb

@@ -7,8 +7,8 @@ module Fog
         identity :id
 
         attribute :name
-        attribute :created
-        attribute :updated
+        attribute :created_at,  'created'
+        attribute :updated_at,  'updated'
         attribute :status
         attribute :server_id,   'serverId'
 

spec/aws/models/ec2/server_spec.rb

@@ -27,7 +27,7 @@ describe 'Fog::AWS::EC2::Server' do
       server.type.should == 'instance_type'
       server.kernel_id.should == 'kernel_id'
       server.key_name.should == 'key_name'
-      server.launch_time.should == 'launch_time'
+      server.created_at.should == 'launch_time'
       server.product_codes.should == 'product_codes'
       server.private_dns_name.should == 'private_dns_name'
       server.ramdisk_id.should == 'ramdisk_id'

spec/aws/models/ec2/snapshot_spec.rb

@@ -11,7 +11,7 @@ describe 'Fog::AWS::EC2::Snapshots' do
         'volumeId'    => 'vol-00000000'
       )
       snapshot.id.should == 'snap-00000000'
-      snapshot.start_time.should == 'now'
+      snapshot.created_at.should == 'now'
       snapshot.volume_id.should == 'vol-00000000'
     end
 
@@ -35,6 +35,7 @@ describe 'Fog::AWS::EC2::Snapshots' do
     it "should return true if the snapshot is deleted" do
       volume = ec2.volumes.create(:availability_zone => 'us-east-1a', :size => 1, :device => 'dev/sdz1')
       snapshot = volume.snapshots.create
+      snapshot.wait_for { status == "completed" }
       snapshot.destroy.should be_true
       volume.destroy
     end

spec/aws/models/ec2/volume_spec.rb

@@ -13,9 +13,9 @@ describe 'Fog::AWS::EC2::Volume' do
         'snapshotId'        => 'snap-00000000',
         'volumeId'          => 'vol-00000000'
       )
-      volume.attach_time.should == 'now'
+      volume.attached_at.should == 'now'
       volume.availability_zone.should == 'us-east-1a'
-      volume.create_time.should == 'recently'
+      volume.created_at.should == 'recently'
       volume.server_id.should == 'i-00000000'
       volume.snapshot_id.should == 'snap-00000000'
       volume.id.should == 'vol-00000000'