Updates to make the providers work with Razor 0.15.0 (from 0.11.0):

* tags are a thing you can create and destroy, not a property of
  installers
* installers are now policies
* a few bug fixes with regards to type (some things that didn't used to
  converge now do)
try to allow nils
remove param
support updating existing tags

note that at the moment, this will *always* force update. For something
managed by Puppet, this seems idea, but it should probably be
parameterized in the future.
Merge pull request #3 from sophaskins/RZR-2

RZR-2: Updates to make the providers work with Razor 0.15.0 (from 0.11.0):