Removed most of the puppet-lint warnings/errors.
Re-introduced "inherits" declaration.

The default parameters are more obvious with "inherits" and Puppet 2.7 is pretty much established now. I guess this ´puppet-lint´ check (see http://puppet-lint.com/checks/class_inherits_from_params_class/) can be safely ignored now.
Merge pull request #6 from mzeis/master

Removed most puppet-lint errors/warnings.