added AIX support
require puppetlabs_spec_helper/rake_tasks

i think that's all you need with a recent version of rspec-puppet and
puppetlabs_spec_helper installed
changed include_class to contain_class, added concat_basedir

- in newer version of rspec-puppet include_class changed to contain_class,
  this fixes an deprecation warning.

- puppetlabs-concat (former ripienaar-concat) require a fact
  concat_basedir that comes with the module.
import fixtures for rspec-puppet

this automatically installs modules this module depends on in
spec/fixtures/modules before running rspec-puppet.
added a note that openldap on AIX depends on openssl
changed the package url to the perzl.org packages.
added support for AIX to spec_helper
removed require openssl

there is currently no module for openssl on aix. i think
it's better to just depend on the package openssl for now.
maybe we should just remove this dependency as well.
rspec style fixes

fixed some style issues: mixed tab and spaces, indention...