Remove variables, switch to inherits.

This commit removes all the local copies of variables in the subclasses
and simply inherits the main class in order to bring variables into the
right scope.
Update default keys file param variable to match init.pp's
Merge pull request #92 from meltwater/keyfile_params

Update default keys file param variable to match init.pp's
Merge pull request #91 from apenney/inherits

Remove variables, switch to inherits.
Release 2.0.0
Merge pull request #94 from apenney/2.0.0

Release 2.0.0
Fix License and release 2.0.1.
Merge pull request #95 from apenney/2.0.1

Fix License and release 2.0.1.