Update PostgreSQL roles due to package version changes

This changeset updates the versions of PostgreSQL roles we use because
new packages were cut for `libpq-dev` and `postgresql-9.3`. These
changes will prevent errors when fresh provisions are attempted.
Remove create_route_table
Remove create_route
Remove create_subnet
Remove create_security_group
Update AWS CLI
Try to break stacks out into stateful vs. stateless buckets
Update Ansible to 1.8.2
Add Nginx to the tile servers so that health checks pass
Start Carbon so that restart handler doesn't cause failure
Remove private DNS template
Adjust key naming to align with client convention
Comment out IAM Roles until we have Parks create them for us
Drop VPC specifics because we have a default VPC
m3.medium -> t2.medium because of AWS account limits
Add PEM files to ignore
Ensure that CloudFormation tasks have build as a dependent task
Make Sass version a default attribute
Need git for deployment
Add django-statsd-mozilla to base requirements file