(HI-273) Support bundler workflow on windows x64

Previously the Gemfile contained windows gem dependencies copy and
pasted from elsewhere.

Hiera only explicitly depends on the win32-dir gem to resolve
its data directory on windows, e.g. C:\ProgramData. As such the
Gemfile is updated to include that dependency.

The dependency is also specified in the project_data.yaml file used
when creating platform specific gems.

Furthermore, win32console is required specifically by spec_helper on
Ruby 1.9.x versions, but not for Ruby 2.  That gem is included
conditionally based on the platform architecture.
Merge branch 'hi-273'

* hi-273:
  (HI-273) Support bundler workflow on windows x64
  closes #197