Update init

Fix issue with wrong pidfile being created by start-stop-daemon.

Using -b on webrick makes it fork right after starting, leaving the pidfile created by start-stop-daemon pointing to a dead process. Switched to start-stop-daemon's --background switch.
Update puppet-dashboard.init

Fixed the stale pidfile problem by removing -d from webbrick's cmdline and relying on daemon's ability to create a pidfile.
Update the init script comments
Merge pull request #1 from sodabrew/vchoi_daemon

Update the init script comments
Merge pull request #197 from vchoi/master

Fix init script in Ubuntu/Debian and Redhat/Centos