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.
Merge remote-tracking branch 'upstream/master'
Refactorization of the https command line option

Renaming the flag variable and the Connector class.
Fixing command line options in init.d script

Adding missing "--host" option and fixing the declaration of other
command line options.
Merge pull request #170 from jtyr/master

Allow to force HTTPS scheme