Proposal for introducing create_resources

[riton]

• Add simple version in main class that allows creating logrotate
  rules in Hiera with:

classes:
  - logrotate

logrotate::rules:
  'syslog':
    [...]

I've not written any documentation or anything more for now. I wanted to know your opinion about this feature before going any further.

[pcfens]

#43 handles this too, and uses a pattern that seems to be more popular/common.

[riton]

#43 adds hiera support but does not allow one to take advantage of deep_merge behavior that could be provided by using hiera_hash function.