Add IISNode IICluster and Autoscaler classes

[chrisgilbert]

I have been using the following to test.

from tyr.clusters.iis import IISCluster
IISCluster(group='chrisgtest', environment='stage', ami='ami-bea09bd6', subnet_ids=["subnet-961652e1", "subnet-9a41d9c3"], desired_capacity=2, min_size=1, max_size=3).autorun()

There are a few issues that need ironing out:

• Problem spinning up servers once in ASG. Need to diagnose

[jamiegs]

I don't think you'll need to worry about Classiclinking. We've got all of our prod web server in VPC, and we're probably not going to need to classic link when migrating or stage servers

[wliao008]

would need access to route53:ChangeResourceRecordSets as well

[citruspi]

This module should either be moved to the tyr.clusters package or the logger name should be changed to correctly reflect the package it belongs to - perhaps Autoscaling.Autoscaler (if the package were renamed autoscaling).

[chrisgilbert]

OK, I have made changes as discussed.

[chrisgilbert]

Meh, my revert didn't reopen the pull request. Not sure what's happened there. I will create a new pull request for these changes