Updated EC2 AMIs for v0.6.0 release.

Fixes #656.

Distributing the Deis controller AMIs as built by `contrib/ec2/prepare-controller-ami.sh`:
```console
Rhialto:deis matt$ ./contrib/ec2/distribute-amis.sh us-west-2 ami-ae85ec9e
+ src_region=us-west-2
+ src_ami=ami-ae85ec9e
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' ap-northeast-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-ae85ec9e --region ap-northeast-1
IMAGE	ami-d3225fd2
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' ap-southeast-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-ae85ec9e --region ap-southeast-1
IMAGE	ami-9e4919cc
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' ap-southeast-2 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-ae85ec9e --region ap-southeast-2
IMAGE	ami-afdb4395
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' eu-west-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-ae85ec9e --region eu-west-1
IMAGE	ami-ebeb159c
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' sa-east-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-ae85ec9e --region sa-east-1
IMAGE	ami-cdcc6ed0
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' us-east-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-ae85ec9e --region us-east-1
IMAGE	ami-15382c7c
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' us-west-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-ae85ec9e --region us-west-1
IMAGE	ami-f60d33b3
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' us-west-2 = us-west-2 ']'
+ continue
Rhialto:deis matt$ 
```
Distributing the Deis node AMIs as built by `contrib/ec2/prepare-node-ami.sh`:
```console
Rhialto:deis matt$ ./contrib/ec2/distribute-amis.sh us-west-2 ami-a085ec90
+ src_region=us-west-2
+ src_ami=ami-a085ec90
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' ap-northeast-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-a085ec90 --region ap-northeast-1
IMAGE	ami-b7225fb6
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' ap-southeast-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-a085ec90 --region ap-southeast-1
IMAGE	ami-904919c2
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' ap-southeast-2 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-a085ec90 --region ap-southeast-2
IMAGE	ami-a9db4393
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' eu-west-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-a085ec90 --region eu-west-1
IMAGE	ami-01eb1576
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' sa-east-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-a085ec90 --region sa-east-1
IMAGE	ami-d3cc6ece
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' us-east-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-a085ec90 --region us-east-1
IMAGE	ami-51382c38
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' us-west-1 = us-west-2 ']'
+ ec2-copy-image -r us-west-2 -s ami-a085ec90 --region us-west-1
IMAGE	ami-ec0d33a9
+ for region in ap-northeast-1 ap-southeast-1 ap-southeast-2 eu-west-1 sa-east-1 us-east-1 us-west-1 us-west-2
+ '[' us-west-2 = us-west-2 ']'
+ continue
Rhialto:deis matt$ 
```