Configuration for aws provider
Move box config into provider group
Removed hard-coded inventory and use ansible.groups

Now provisioner runs on AWS but provisioning expects user 'vagrant', while aws image uses 'ubuntu'
Remove hard-coded /home/vagrant paths
Remove hard-coded 'vagrant' owner from dryad_code.yml
Check YML format and use config overrides
Remove attempts to template the all.template file
Add quotes for install missing poms
fix typo in dryad_code.yml
Fix typo in motd
Merge pull request #18 from datadryad/aws

Support Vagrant's AWS Amazon EC2 provider