Support for transport pipe configuration
Merge pull request #238 from aquto/feature/transportPipeSupport

Support for transport pipe configuration
Fixing dependencies parameter on sensu_check type
Merge pull request #240 from Phracks/master

Fixing dependencies parameter on sensu_check type
Add validation and spec for pipe transport

This builds on work already merged for supporting the pipe transport. It
provides validation that the pipe is a hash and adds a spec. This makes
the pipe property's implementation more consistent with other properties.