feat(cloudformation-template) extract parameters and update ubuntu's package repository

* extract availability zones
* introduce InstanceName parameter to tag launched instances with a name
* make sure the package repository is up to date
fix(cloudformation-template) add s3_region as parameter

To use the correct s3 region for the configured s3 bucket it is now also possible to specify the s3 region as parameter.
fix(cloudformation-template) add standalone and disable_token_auth parameters to get private authentification working
fix(cloudformation-template) removes s3 region again because of this issue https://github.com/dotcloud/docker-registry/issues/400
Merge remote-tracking branch 'upstream/master'

Conflicts:
	docker-registry.json
fix(docker-registry) remove InstanceName parameter to tag just instances.
Merge pull request #1 from tadodotcom/master

feat(cloudformation-template) extract parameters and update ubuntu's pac...