Add attribute to define default service action

Internally we need to be able to install nexpose without it starting
right away. Externally, customers using this cookbook expect for the
service to start immediately after the installation occurs. This
patch also fixes a bug in which the nexpose service would not start
on Linux after installation.
Clean-up commits for PR #11

There was a few files I accidentally committed which should be in
a separate PR. This pulls them out for now.
Merge pull request #11 from rapid7-cookbooks/feature/issue/9

Add attribute to define default service action