Fixing command line options in init.d script ...

Adding missing "--host" option and fixing the declaration of other
command line options.

Allow to force HTTPS scheme ...

If the standalone GitBucket instance runs behind HTTPS proxy, the
repository URL always shows HTTP scheme dispute the fact that the
connection is HTTPS. This patch is adding a command line option which
allows to force the HTTPS scheme.

System support for RedHat ...

This commit is adding init.d script and sysconfig file which allows to
run GitBucket in the standalone mode. It also adds the spec file which
allows to build RPM package.