rotate_every_kb, and number_of_files are integers
rotate_every_kb, and number_of_files are integers

If the rotate_every_kb and number_of_files parameters are used under
file output, they should be explicitly typed as integers to keep filebeat
happy.

Fixes #13

digitalmediacenter/puppet-filebeat,MiamiOH/puppet-filebeat,digitalmediacenter/puppet-filebeat,pcfens/puppet-filebeat,MiamiOH/puppet-filebeat,pcfens/puppet-filebeat