add Makefile

[mroch]

I scripted the installation instructions from the README (super detailed, thanks!) using the aws CLI.

just run aws configure first to set up your credentials, then make should set everything up. there are a couple variables at the top of Makefile in case you want to rename policies, roles, etc. still need to manually patch conf in dyndns53.py though.

it creates a bunch of state files in a build/ directory which it uses to keep track of ARNs and IDs it needs, and to make it idempotent so you can run make multiple times without getting errors. if you update dyndns53.py and rerun make, it'll just upload the changes.

tested on Mac.

[sTywin]

Thanks, this looks great :)

I haven't forgotten about it, I've just been super tied up, so haven't gotten around to testing it. I want to make sure I can use it reliably end-to-end before I pull it in. I'll want to update the README as well.

[asheiduk]

Thank you for the Makefile, it is makes the setup much easier.
I've noticed two rough things:

• If the build directory does not exist, it is not created but errors occur.
• I have changed lambda_region at the top of the Makefile to something other than the default-region used by the aws CLI. The result were strange and hard to correct errors.