Minor install.pp cleanup.
Minor install.pp cleanup.

$installdir can be owned by root

Fixes #255

mkrakowitzer/puppet-jira,puppet-community/puppet-jira,voxpupuli/puppet-jira,mkrakowitzer/puppet-jira,mkrakowitzer/puppet-jira,voxpupuli/puppet-jira,puppet-community/puppet-jira,puppet-community/puppet-jira