Changed WinRMPortNotDetected to WinRMNotReady
Renamed config_spec to windows_config_spec
Split winrm and windows config tests into separate files

Added unit test descriptor to the winrm config tests so they run with the spec rake task.
Remove unused host and port attributes from error
Fixed issue 104

The WinRM.host config value now overrides the host value returned from the machine's ssh_info(). To enable this the default value for the winrm.host was changed to null since we can lean on the ssh_info[:host] default value and we need to know if the user explicitly set a value in the Vagranfile config.

Added unit tests to cover the winrmfinder host method.
Merge pull request #111 from WinRb/fix-issue-104

Fix issue 104