Reworking of rpm buid to create signed pacakges in a structured repository

Squashed commits:
[331bb1d] Add README and signing
[e1e14e4] Rewrite of script
[6ea0d40] Packaging reworking
Merge pull request #14 from mattwillsher/build_reworking

RPM build reworking
remove spaces on VERBOSE variable to acutally make it work
remove indention
Merge pull request #17 from bastilian/master

Fix init.d script
Change user and group ownership to the defined ghost user

The following makes sure that the owner and group of the /var/opt/ghost is the same as the one specified in the environmental variables instead of the hardcoded "ghost" user/group.
add sample systemd service file
Merge pull request #20 from jpope777/systemd

add sample systemd service file
Merge pull request #19 from atiti/patch-1

Change user and group ownership to the defined ghost user