Release 0.4.2

This release pins to rspec 2.x so that compatible modules may require
this version of puppetlabs_spec_helper and receive the correct rspec
configuration.

Future versions will pin to newer versions of rspec so that modules may
take advantage of the changes introduced in rspec 3
Merge pull request #58 from hunner/release_0.4.2

Release 0.4.2