using default AWS SDK credentials search path

[hakamadare]

I notice that since 0.0.4 you've removed the calls to Puppet_X::Bobtfish::Ec2_api.get_creds in favor of using the default credential search procedure in the AWS SDK (which is great!); however, I've run into an upstream bug (aws/aws-sdk-ruby#604) which means that the shared credential file credentials provider is broken out of the box under Ruby 1.8.7.

I can work around the issue by explicitly passing a path to the credentials file, but that breaks the search procedure; I don't know what (if anything) you want to do about this, but I figured I'd bring it to your attention.