Bump rspec-puppet to 0.1.5 for Puppet 3.0
Bump rspec-puppet to 0.1.5 for Puppet 3.0

This is required for Puppet 3.0 support. All API related changes.
Changelog is available here:

- https://github.com/rodjek/rspec-puppet/compare/v0.1.4...v0.1.5

However plenty of tests will still be broken per the previous commit.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet