Add parameter to specify an alternate package name to install

Change parameter name per comment on pull request #42

https://github.com/puppetlabs/puppetlabs-haproxy/pull/42#discussion_r5856331
Merge pull request #42 from rharrison10/rharrison/pkg_name

Add parameter to specify an alternate package name to install
Update CHANGELOG

Fixed typo.
Merge pull request #45 from godp1301/patch-2

Update CHANGELOG