Touchdown

-------------------

- Add a simple template resource that can be used anywhere a string can be
used.

- Fix a regression in handling paginated resources that raise errors when no
resources can be found.

-------------------

- Add support for SSHing into EC2 instances (even going via other EC2 instances
managed by an autoscaling group).

- Add CloudWatch events. In particular you can now define schedules to drive
lambda functions.

- Fix support for nested resources in API Gateway.

- Makes `namesapce` a required field on a CloudWatch Alarm.

- Add a max length on the lambda function description field.

- Add support for key filters when setting up S3 notifications.

- S3 ported to use the `annotate_object` API.

- Allow CloudWatch Alarm's to trigger an SNS Topic.

- Fix the describe filters for NAT Gateway (which should let Touchdown actually
find NAT Gateways now).

- Ignore invalid IP addresses when loading existing IP allocations.

- Don't try and use `sudo` when SSH'd into a node as `root`.

- Fix passing `File` resources to string arguments.

- Only present an SSH agent if a `private_key` is provided.

-------------------

- Fix SSH agent forwarding.

-------------------

- Windows fixes.

- CloudFront compatibility improvements (more resiliant to upstream API changes).

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- Add support for S3 bucket acceleration.

- Given a dictionary of SSH keys paramiko will now make them available as
though through agent forwarding.

- Add support for standing up standalone EC2 instances (outside of an ASG).

- Ensure ElastiCache replication group knows its max name length.

- Allow a load balancer to be used as CustomOrigin.

We are now only testing with paramiko 2.0.0 and later. This has dropped
pycrypto in favour of cryptograph (which we already depend on).

------------------

- Touchdown can now manage allocation of parts of a network range through the
`ip_network` type::

network = config.add_ip_network(
name='subnets',
network='10.41.0.0/20',
)

app_serves = network.add_ip_allocation(
name='app_servers',
size='25',
)

This would allocate the first available `/25` in `10.41.0.0/20`.

- Add support for using the `tail` command against CloudFront distributions.