Add membrane dependency to bosh_cpi gemspec

This runtime dependency already existed but was not called out in the gemspec.

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>
Remove deprecation warnings

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>
Bosh::Registry#update_settings considers 2xx successful

Rather than just 200.

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>
Add bin/aws_cpi to bosh_aws_cpi

Signed-off-by: Maria Shaldibina <mariash@pivotal.io>